Brett Parker wrote:
BINGBINGBINGBING...
Time to get lunch out of the microwave....
- Has the server got a fixed IP?
- Has the server got a *valid* PTR record
Without those, you're fighting a losing battle talking directly to the MX servers anyways.
Yeah, I know, but this is specifically for me logging into a box via SSH and sending a file "home", ie to me, so I have some control over the checks which take place on the incoming mail.
On top of that, with the adoption of greylisting, and with sender callouts, you need to make sure that the MX for the domain you're sending from is available, you need to be able to queue mail, and that the MX for the domain you're sending from will let people do callbacks.
If none of that makes sense - use a smart host. Seriously.
It does make sense, and the smart host comment is agreed with in general.