Email specifications
If you are sending promotional emails using the web interface, use the built-in email editor to create, optimize, manage, and track your messages.
Check the following email specifications:
| Specification | Value |
|---|---|
| Max total email size | 25 MB |
| Max attachment size | 20 MB (unsupported types: ade, adp, apk, appx, appxbundle, bat, cab, chm, cmd, com, cpl, dll, dmg, ex, ex_, exe, hta, ins, isp, iso, jar, js, jse, lib, lnk, mde, msc, msi, msix, msixbundle, msp, mst, nsh, pif, ps1, scr, sct, shb, sys, vb, vbe, vbs, vxd, wsc, wsf, wsh) |
| Subject line | Max 200 characters (emojis count as 2 characters) |
| Preheader | Max 75 characters (emojis count as 2 characters) |
| HTML size limit | 10 MB |
| Max attachments | 20 |
| Image handling | All images are externally linked (not embedded) |
| Request rate limits | 2000 requests per second (per account) |
| Data retention | See the data retention policy (opens in a new tab) for full data handling and retention rules. |