Allowed Attachments
What attachment types and sizes are supported?
ImprovMX forwards emails with attachments under specific size and type restrictions.
Size Limits
We forward emails with attachments for up to 50MB per email (including message and attached files).
Note: Receiving mail servers may have their own limits. For example, Gmail caps attachments at 25MB.
Prohibited File Types
For security purposes, ImprovMX blocks certain file extensions that align with restrictions used by major email providers. The following extensions are not allowed:
| Blocked Extensions |
|---|
.ade, .adp, .bat, .chm, .cmd, .com, .cpl, .dll, .exe, .hta, .ins, .isp, .jar, .jse, .lib, .lnk, .mde, .msc, .msi, .msp, .mst, .nsh, .pif, .scr, .sct, .shb, .sys, .vb, .vbe, .vbs, .vxd, .wsc, .wsf, .wsh |
These restrictions focus on executable and potentially dangerous file types that pose security risks.
Still have questions? Feel free to reach out to our support team!