Understanding Attachment Size Limits for SMS and Email Communications

SMS Attachment Size Limits #

Sending multimedia messages (MMS) via SMS is a powerful way to engage with your audience. However, it’s crucial to understand the size limitations imposed by carriers and the CRM to ensure successful delivery.

Details #

• MMS Capability: Ensure your number is MMS capable. This information can be found in your account settings under the “phone numbers” tab. 
• Attachment Limits: The CRM supports up to 10 attachments, with the total size of the text and attachments not exceeding 5 megabytes. However, carrier limits vary, typically ranging from 300 kilobytes to 3.5 megabytes. For optimal delivery, it’s recommended to keep attachments under 500 kilobytes. 
• Supported File Types: JPEG, PNG, and GIF are supported for SMS attachments. 
• Special Considerations: For toll-free numbers, ensure attachments are 600 kilobytes or smaller due to specific carrier restrictions.

Troubleshooting Tips  #

• If an MMS fails to send, check the total size of your message and attachments. Reducing the file size may resolve the issue.
• Verify that your number is MMS capable and that the file types are supported.

FAQs #

Can I send MP4 files via SMS? #

Currently, MP4 files cannot be sent directly. However, recording a video in the mobile app generates a clickable link for recipients. Ensure the link matches your domain and client’s brand name for compliance with carrier regulations.

Email Attachment Size Limits #

Email servers impose size limits on attachments to prevent server overload. Understanding these limits is key to ensuring your emails are successfully received.

Details #

• Server Limitations: Most email servers have a maximum size limit for emails, which includes the body text and attachments. Exceeding this limit results in bounced emails. 
• Provider Variations: Attachment size limits vary by email provider. For instance, Mailgun supports a maximum message size of 25 megabytes. It’s advisable to keep attachments as small as possible to accommodate different providers. 
• Error Notifications: If an email exceeds the maximum size, you’ll receive an error notification in your conversation tab, typically indicating the attachment size exceeded the allowable limit.

Troubleshooting Tips #

• To avoid exceeding size limits, consider compressing attachments or using lower-resolution images. 
• If an email bounces due to size limits, try reducing the attachment size and resending.

FAQs #

Can I bypass maximum email size limits?  #

No, bypassing these limits is not possible. Instead, upload the files to a cloud service and include a download link in your email as a workaround.

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