What does validating mx record mean

Posted by / 07-Jul-2017 12:06

DNS lookups can be slow at times, depending on network traffic & congestion, so that's something to be aware of.If I were in your shoes, I'd test it out and see how it goes.if the PTR reverses to something not well defined it will be verifyed on most MTAs before being accepted and besides that most IP ADDRESS are checked against RBLS to ensure they are not spammers, besides those there are aswell other verification which vary from server to server, so i don't belive your email will be marked as spam, but it also depends on it is content. It uses this to connect to your machine on port 25 and try to deliver the mail.Since the other machine is sending (not accepting), it will not to anti-spam checks based on your machine. Your machine (this does not have to be the same as the MX record) connects to the remote mail server and tries to deliver the mail. It has two pieces of information from your machine: The '' and the IP address.If a CNAME record is found instead, the resulting name is processed as if it were the initial name.If no MX records are found, but an A RR is found, the A RR is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host.I need some help on clarification of the reverse DNS and MX record setup. BUT: it's a shared server, so it will never resolve to my - it will always resolve to - right?

I have read (and i am sceptical about this myself) that you should never leave this type of validation up to remote lookups, but why?Nowadays most servers demand that the 'HELO name' is a fully qualified domain name and that it resolves to your IP address.Some demand that your IP address has reverse DNS that does not look dynamic (like To make it sure I understand correctly: If my web server running some Java service tries to send notification mail to say "[email protected]", and it uses server as SMTP server, then the HELO/EHLO conversation occurs between myprovider and gmail server (not between myprovider and my web server), right?I am using a spam filtering service (defensio) but the spam scores returned are overlapping with valid messages.At a threshold of 0.4 some spam gets through and some customer's questions are wrongly thrown in a log and an error displayed.

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Some comments were made about asking the mail server for the user to verify, i felt this would be too much traffic and might get my server banned or into trouble in some way, and this is only to cut out most of the emails that were being bounced back due to invalid server addresses.