-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Monday 2006-11-27 at 12:30 +0100, Sandy Drobic wrote:
Just to clarify a few general things about SMTP:
I'm saving these notes ;-)
- the HELO string that the sending server is using is not derived from DNS, it's usually the hostname that is configured locally on the machine. RFC 2821 says, this string has to be a resolvable FQDN for a domain/host.
Fortunately (for me) not many enforce this.
- a sending server does not neccessarily need a MX record, only correct A record and reverse DNS
Unless some one enforces it on the receiving end as an antispam measure, I guess :-?
- the MX record is used to announce servers that will accept mail for a domain, not neccessarily server that will send for a domain.
- if the server is both sending and receiving mails for a domain, then all records (MX, A, reverse DNS) are neccessary.
- if no MX record is set for a domain, mail will be sent to the A record of that domain. Though you should set a MX record.
I think that it is usually rejected as domain must exist or similar message, but again, that may be an antispam measure. - -- Cheers, Carlos E. R. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFFatD3tTMYHG2NR9URAr6oAKCH4aPtsatCJxyOJR4r12XBtlTJ6QCfVptH O3KzoXxG4m8Sd1pfJrMB+J4= =LNdn -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org