External STMP Relay

[andremta]

Hello,

Sometimes I'm having problem with my email server IP which sometimes is classified as spammer.

Can I use an external SMTP/Outbound relay to bounce emails?

If yes, is it possible to my local domain not use this external relay so I can get internal mails delivered instantly?

[andremta]

(Sorry but I'm not advertising any service...)

DynDNS.com - Services -- MailHop Outbound

Will I have problems with no REVERSE DNS matching?

[uxbod]

Why not use your upstream ISP mail server ?

[andremta]

Originally Posted by uxbod

Why not use your upstream ISP mail server ?

That could be an option! Will I have problems with no Reverse DNS matching?

[uxbod]

Shouldn't do as your ISP should have the rDNS in place for their mail server

[andremta]

Originally Posted by uxbod

Shouldn't do as your ISP should have the rDNS in place for their mail server

Ok, I will try it. I think it might be the better option.

[andremta]

Originally Posted by uxbod

Shouldn't do as your ISP should have the rDNS in place for their mail server

What if my ISP do now allow relay without authentication?

[phoenix]

Originally Posted by andremta

What if my ISP do now allow relay without authentication?

It's been mentioned in the forums once or twice.

http://wiki.zimbra.com/index.php?tit...Authentication

[andremta]

Originally Posted by phoenix

It's been mentioned in the forums once or twice.

Outgoing SMTP Authentication - Zimbra :: Wiki

Thanks!

[andremta]

If I configure the Thunderbird to use directly my ISP SMTP (with no authentication nor security) it works!

But... When I configure in Zimbra admin to relay at the same SMTP is does not!

Jul 9 19:45:32 zimbra-box postfix/smtp[10843]: 4B84F23A003: to=<myemail@hotmail.com>, relay=mail.myisp.com[xxx.xxx.xxx.xxx]:25, delay=0.22, delays=0.01/0/0.11/0.09, dsn=5.7.1, status=bounced (host mail.myisp.com[xxx.xxx.xxx.xxx] said: 550 5.7.1 Unable to relay for myemail@hotmail.com (in reply to RCPT TO command))

Why is this?