Check the total email size first
The message body, encoding, and attachments all contribute to the total size; the source file size is not the final email size.
Attachment limits
Receiving an attachment
doesn't mean it's suitable for sharing secrets
Attachments pass through the sender's system, the receiving gateway, and your browser download. Temporary inboxes and forwarding aliases have different retention periods and control responsibilities.
Risky formats may be rejected
Executables, scripts, and disguised archives may be blocked by an upstream service or the destination mailbox.
Verify the source before downloading
An attachment appearing in your inbox doesn't mean it's safe. Don't open unfamiliar attachments or enable macros.
Don't treat an expired inbox as a vault
Once a temporary mailbox expires, you can't rely on its attachment links. Save important files elsewhere.
| Processing stage | Temporary inbox | Forwarding alias | What you should do |
|---|---|---|---|
| Receive | Try to receive it while the address is valid | Receive and forward within your account quota | Ask the sender to keep the file small and use common formats |
| Display | Available attachments are listed on the web page | Attachments are listed in the archive details | Check the filename, file type, and sender |
| Download | Access it with your current mailbox permissions | Requires a valid login token | Don't forward authenticated download links |
| Retention | No longer than the mailbox lifetime | Archives are typically retained for 30 days | Move important files to trusted storage promptly |
Suitable for receiving
Public documentation, one-time tickets, low-sensitivity images, and test reports are suitable when the sender is known and the task can be completed before the address expires.
Not suitable for receiving
Identity documents, medical records, private keys, payroll documents, unencrypted financial data, and any unique file that cannot be replaced if lost.
Why shouldn't I save attachment links for long-term use?
Links may depend on your current mailbox credentials, login token, and retention window. Once the address or session expires, an old link cannot be used as a permanent public URL.
Does QuickMX guarantee that attachments are virus-free?
No. Filtering can reduce some risks, but it cannot replace endpoint protection and human judgment. Compressed archives, macro-enabled documents, and executable content should be checked in an isolated environment.
Why is the attachment missing from the destination mailbox after forwarding?
The destination provider may remove or reject attachments based on its own size and file-type policies. Check bounced messages, spam, and security alerts, and ask the sender to use a trusted file-sharing method instead.