To ensure optical performance and deliverability, Mailjet's campaign tool does not support attachments.
For users who require attachments, Mailjet provides this functionality via the SMTP relay or API. However, the total size of the email must not exceed 15MB.
Why we recommend avoiding attachments in bulk emails
Sending attachments with bulk emails may trigger red flags with Internet Service Providers (ISPs). ISPs often view bulk emails containing attachments as suspicious and may classify them as spam. Additionally, attachments can face restrictions such as file size limitations, blocking by recipient email programs, or low engagement rates due to mistrust.
Consider your recipients' perspective: how often do you open attachments from bulk emails?
Our recommendation
Instead of sending attachments, host your files online and share the download link in your email. This approach benefits your campaign by improving deliverability and enabling you to track link clicks, providing valuable insights into recipient engagement.