{"id":34963,"date":"2026-07-15T07:20:40","date_gmt":"2026-07-15T07:20:40","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34963"},"modified":"2026-07-15T09:15:29","modified_gmt":"2026-07-15T09:15:29","slug":"email-size-limits-maximum-for-sending-and-receiving-with-1-grid","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/email-size-limits-maximum-for-sending-and-receiving-with-1-grid\/","title":{"rendered":"Email Size Limits: Maximum for Sending and Receiving with 1-grid\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Knowing the maximum email size limits for sending and receiving can help improve email reliability and reduce the risk of messages being delayed, rejected, or returned to the sender.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide will help you understand the maximum email size supported when sending emails from your 1-grid email service, what counts towards the size limit, and how to avoid delivery issues caused by large attachments.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2026\/07\/1-grid-Images-for-KB-Articles-1000-x-600-px-63.png\" alt=\"What Is the Maximum Email Size for Sending and Receiving with 1-grid?\" class=\"wp-image-34993\"\/><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-ht-block-toc is-style-rounded htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Quick Links<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#htoc-understanding-the-maximum-email-size\">Understanding the Maximum Email Size Limits&nbsp;<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-sending-emails\">Sending Emails&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-receiving-emails\">Receiving Emails&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-steps-to-managing-your-email-size-limits\">Steps to Managing Your Email Size Limits<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-step-1-check-the-total-size-of-your-email\">Step 1: Check the Total Size of Your Email&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-step-2-reduce-attachment-size-if-necessary\">Step 2: Reduce Attachment Size if Necessary&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-step-3-consider-alternative-file-sharing\">Step 3: Consider Alternative File Sharing&nbsp;<\/a><\/li><\/ul><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 id=\"htoc-what-this-means\" class=\"wp-block-heading\"><strong>What This Means<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every email service has limits on the size of messages that can be sent or received. These limits include the entire email, not just the attachment.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The total email size includes:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-email-message-itself\">The email message itself&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-all-file-attachments\">All file attachments&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-email-formatting-and-encoding-overhead\">Email formatting and encoding overhead&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If an email exceeds the maximum supported size, it may&nbsp;fail to&nbsp;send or be rejected by the receiving mail server.&nbsp;<\/p>\n\n\n\n<h2 id=\"htoc-understanding-the-maximum-email-size\" class=\"wp-block-heading\"><strong>Understanding the Maximum Email Size Limits<\/strong>&nbsp;<\/h2>\n\n\n\n<h6 id=\"htoc-sending-emails\" class=\"wp-block-heading\"><strong>Sending Emails<\/strong>&nbsp;<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Emails sent through&nbsp;<strong><a href=\"https:\/\/www.mailchannels.com\/about\/\" target=\"_blank\" rel=\"noreferrer noopener\">MailChannels<\/a><\/strong>&nbsp;support a maximum message size of&nbsp;<strong>25 MB<\/strong>, including all attachments.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means the combined size of the following cannot exceed&nbsp;<strong>25 MB<\/strong>:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-a-single-large-attachment\">A single large attachment&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-multiple-smaller-attachments\">Multiple smaller attachments&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-the-email-content-and-attachment-encoding\">The email content and attachment encoding&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Although 25 MB is supported, sending smaller emails&nbsp;generally improves&nbsp;delivery performance.&nbsp;<\/p>\n\n\n\n<h6 id=\"htoc-receiving-emails\" class=\"wp-block-heading\"><strong>Receiving Emails<\/strong>&nbsp;<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">The maximum size of emails you can receive may vary depending on the sender&#8217;s email provider, their mail server configuration, and any limits enforced by the receiving mail system.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are expecting a large email that does not arrive, it may have been rejected before reaching your mailbox due to size restrictions on the sending or receiving mail servers.&nbsp;<\/p>\n\n\n\n<h2 id=\"htoc-steps-to-managing-your-email-size-limits\" class=\"wp-block-heading\">Steps to Managing Your Email Size Limits<\/h2>\n\n\n\n<h6 id=\"htoc-step-1-check-the-total-size-of-your-email\" class=\"wp-block-heading\"><strong>Step 1: Check the Total Size of Your Email<\/strong>&nbsp;<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Before sending an email with attachments:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-check-the-size-of-each-attachment\">Check the size of each attachment.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-remember-that-multiple-attachments-are-added-together\">Remember that multiple attachments are added together.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-allow-for-additional-overhead-created-during-email-encoding\">Allow for&nbsp;additional&nbsp;overhead created during email encoding.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h6 id=\"htoc-step-2-reduce-attachment-size-if-necessary\" class=\"wp-block-heading\"><strong>Step 2: Reduce Attachment Size if Necessary<\/strong>&nbsp;<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">If your email approaches the size limit:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-compress-files-into-a-zip-archive\">Compress files into a ZIP archive.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-resize-large-images-where-appropriate\">Resize large images where&nbsp;appropriate.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-remove-unnecessary-attachments\">Remove unnecessary attachments.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-send-files-separately-instead-of-in-one-email\">Send files separately instead of in one email.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h6 id=\"htoc-step-3-consider-alternative-file-sharing\" class=\"wp-block-heading\"><strong>Step 3: Consider Alternative File Sharing<\/strong>&nbsp;<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">For&nbsp;very large&nbsp;files, consider using a secure cloud storage or file-sharing service and include a download link in your email instead of attaching the files directly.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can improve delivery success and make downloading easier for recipients.&nbsp;<\/p>\n\n\n\n<h2 id=\"htoc-important-things-to-know\" class=\"wp-block-heading\"><strong>Important Things to Know<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-25-mb-limit-applies-to-the-total-email-size-not-just-the-attachment\">The&nbsp;<strong>25 MB limit<\/strong>&nbsp;applies to the total email size, not just the attachment.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-attachment-encoding-increases-the-size-of-files-during-transmission\">Attachment encoding increases the size of files during transmission.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-recipient-mail-providers-may-enforce-lower-maximum-email-sizes\">Recipient mail providers may enforce lower maximum email sizes.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-large-emails-may-take-longer-to-upload-and-download-depending-on-your-internet-connection\">Large emails may take longer to upload and download depending on your internet connection.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-delivery-can-still-fail-if-the-recipient-s-mail-server-accepts-smaller-messages-than-yours\">Delivery can still fail if the recipient&#8217;s mail server accepts smaller messages than yours.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-before-you-move-on\" class=\"wp-block-heading\"><strong>Before You Move On<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before sending a large email:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-the-total-attachment-size-is-below-25-mb\">Confirm the total attachment size is below 25 MB.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-verify-you-are-sending-from-the-correct-email-account\">Verify you are sending from the correct email account.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-consider-whether-cloud-file-sharing-is-a-better-option\">Consider whether cloud file sharing is a better&nbsp;option.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-ask-the-recipient-whether-their-email-provider-accepts-large-attachments-if-you-re-unsure\">Ask the recipient whether their email provider accepts large attachments if&nbsp;you&#8217;re&nbsp;unsure.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-common-mistakes-to-avoid\" class=\"wp-block-heading\"><strong>Common Mistakes to Avoid<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-assuming-only-the-attachment-size-counts-towards-the-limit\">Assuming only the attachment size counts towards the limit.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-sending-multiple-attachments-that-exceed-the-total-message-size\">Sending multiple attachments that exceed the total message size.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-forgetting-that-email-encoding-increases-file-size\">Forgetting that email encoding increases file size.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-sending-large-multimedia-files-when-a-download-link-would-be-more-suitable\">Sending large multimedia files when a download link would be more suitable.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-assuming-every-email-provider-supports-the-same-attachment-limits\">Assuming every email provider supports the same attachment limits.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-if-this-didn-t-work\" class=\"wp-block-heading\"><strong>If This Didn&#8217;t Work<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If your email&nbsp;fails to&nbsp;send or a recipient cannot receive it, collect the following information before contacting Support:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-sender-s-email-address\">The sender&#8217;s email address.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-the-recipient-s-email-address\">The recipient&#8217;s email address.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-the-approximate-attachment-size\">The approximate attachment size.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-any-error-message-or-bounce-back-notification\">Any error message or bounce-back notification.&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-screenshots-if-available\">Screenshots (if available).&nbsp;&nbsp;<\/li>\n\n\n\n<li id=\"htoc-the-time-the-email-was-sent\">The time the email was sent.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-related-articles\" class=\"wp-block-heading\"><strong>Related Articles<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-understanding-email-restrictions\"><a href=\"https:\/\/1grid.co.za\/knowledge\/email-restrictions\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Understanding Email Sending Restrictions&nbsp;&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li id=\"htoc-why-are-my-emails-being-rejected\"><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=SMTP&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Why Are My Emails Being Rejected?&nbsp;&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li id=\"htoc-how-to-reduce-email-attachment-sizes\"><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-zip-attachments-to-stay-within-the-send-limit-of-25mb\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Reduce Email Attachment Sizes&nbsp;&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li id=\"htoc-understanding-email-delivery-delays\"><a href=\"https:\/\/1grid.co.za\/knowledge\/unable-to-send-emails-receiving-is-fine-how-to-fix\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Understanding Email Sending Errors&nbsp;&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li id=\"htoc-how-email-authentication-improves-delivery\"><a href=\"https:\/\/1grid.co.za\/knowledge\/monthly-bandwidth-does-email-count-towards-this-with-1-grid\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Monthly Bandwidth: Does Email Count Towards This with 1-grid?<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-faqs\" class=\"wp-block-heading\"><strong>FAQs<\/strong>&nbsp;<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What is the maximum email size I can send?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-what-is-the-maximum-email-size-i-can-send\">Emails sent through\u00a0MailChannels\u00a0support a maximum total message size of\u00a0<strong>25 MB<\/strong>, including attachments.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Does the 25 MB limit include attachments?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-does-the-25-mb-limit-include-attachments\">Yes. The limit includes the email body, all attachments, and the\u00a0additional\u00a0encoding\u00a0required\u00a0during transmission.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Why did my email fail even though it was under 25 MB?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-why-did-my-email-fail-even-though-it-was-under-25-mb\">The recipient&#8217;s mail server may have a lower size limit than the sending server, or the message size may have increased due to email encoding.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Can I send multiple attachments?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-can-i-send-multiple-attachments\">Yes, provided the combined total message size does not exceed 25 MB.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Why do attachments become larger when sent?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-why-do-attachments-become-larger-when-sent\">Email attachments are encoded before transmission, which increases their overall size.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What&#8217;s\u00a0the best way to send\u00a0very large\u00a0files?\u00a0<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-what-s-the-best-way-to-send-very-large-files\">For files larger than the supported email size,\u00a0it&#8217;s\u00a0generally better\u00a0to upload them to a secure file-sharing service and send the recipient a download link.\u00a0<\/p>\n<\/details>\n\n\n\n<h2 id=\"htoc-empowering-insight\" class=\"wp-block-heading\"><strong>Empowering Insight<\/strong>&nbsp;<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"300\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2026\/03\/1-grid-Images-for-KB-Articles-1000-x-600-px-1600-x-300-px.png\" alt=\"Empowering Insight - Email Limits: Maximum Size for Sending and Receiving with 1-grid\" class=\"wp-image-34464\"\/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Most email delivery issues involving large attachments can be avoided with a few simple checks before sending. By keeping your total message size below the supported limit and using file-sharing services for larger files, you can improve delivery success and ensure your recipients receive your emails without unnecessary delays.&nbsp;<\/p>\n\n\n\n<h2 id=\"htoc-need-additional-support\" class=\"wp-block-heading\"><strong>Need Additional Support?<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If&nbsp;you&#8217;ve&nbsp;worked through the steps in this guide and are still unable to send or receive large emails,&nbsp;we&#8217;re&nbsp;here to help.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before you <a href=\"https:\/\/1grid.co.za\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>contact us<\/strong><\/a> so that our 1-grid Support team can help, gather the recommended information listed in the&nbsp;<strong>If This Didn&#8217;t Work<\/strong>&nbsp;section. Providing these details upfront will help us investigate the issue more efficiently and resolve it as quickly as possible<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Knowing the maximum email size limits for sending and receiving can help improve email reliability and reduce the risk of messages being delayed, rejected, or returned to the sender.&nbsp; This guide will help you understand the maximum email size supported when sending emails from your 1-grid email service, what counts&#8230;<\/p>\n","protected":false},"author":21,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"ht-kb-category":[1173,1194],"ht-kb-tag":[1872,1868,1871,1695,344,1867,1514,598,1870,1869],"class_list":["post-34963","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_category-email-troubleshooting","ht_kb_tag-attachment-limits","ht_kb_tag-email-attachments","ht_kb_tag-email-best-practices","ht_kb_tag-email-delivery","ht_kb_tag-email-hosting","ht_kb_tag-email-size-limits","ht_kb_tag-email-troubleshooting","ht_kb_tag-mailchannels","ht_kb_tag-receiving-emails","ht_kb_tag-sending-emails"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - 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