Author: Peter Bowyer Date: To: exim-users Subject: Re: [Exim] Exim - 550 relaying to <user@host> prohibited by administrator
Jonathan Telep wrote: > Is this some goofy security "feature" that's turned on somewhere else in the operating system?
No, it's an absolutely essential 'feature' in Exim which stops your server
turning into an open relay.
2 approaches:
- Add your client's IP to a hostlist which might be called
'relay_from_hosts', and might also be referenced in an acl_smtp_rcpt ACL
which may be called smtp_check_rcpt. (Can't be more specific because it's
dependent on how you set your configure file up. These settings are from the
default template).
or better,
- Implement SMTP Authentication, so your clients can send mail whatever IP
they show up from. For bonus points, do this on the MSA port (587), not on
port 25.
