Postfix is unable to send e-mail to aliases.

[FeraTechInc]

All my websites and even the SMTP server is unable to send an e-mail to an alias. It just errors out.

Is there any way to correct this?

[till]

As usual, post the exact error message from the mail log if we shall be able to help you.

[FeraTechInc]

I actually figured this out.

For those having the same problem.

We use an external server for our domain registration and DNS settings. We were also using them for our e-mail forwards. However, when using ISPConfig to send outgoing mail to these forwards we needed to set these forwards within ISPConfig as well.