relaying problems (outgoing mail)

[AlaskanWolf]

Alot of my customers (well sporaticly) are starting to open a bunch of these tickets, all bascially the same error which is

550 Host (theirdomain.com) [users-ip] is not permitted to relay through server.domain.com.

Many of my customers confirm they have the &login to smtp& checkmarked in their programs yet still get such error

any suggestions?

 

[feanor]

Is there more to the error?
What's in exim_mainlog ?

This might have something to do with reverse dns which exim is being increasingly anal about lately. If people attempting to relay through don't have valid reverse dns it eats the message and sez they aren't permitted.

Your server's exim mainlog (and perhaps rejectlog?) should have more detail to help pinpoint this.

 

[AlaskanWolf]

i think these are the correct entries

2002-07-07 13:49:41 refused relay (host) to &[email protected]& from &[email protected]& H=(leaderschool.org) [194.158.202.162] (failed to find host name from IP address)
2002-07-07 13:49:46 refused relay (host) to &[email protected]& from &[email protected]& H=(leaderschool.org) [194.158.202.162] (failed to find host name from IP address)

 

[feanor]

Yea, it's all related to reverse dns.
Lovely.
Some ISPs don't set that up for their dialup/dsl users, which is pretty poor.

I think you can turn off that requirement in your /etc/exim.conf , do a search for &reverse& and &lookups& within the file.
It's at your own risk though.

 

[hst]

I've had this a lot

ISPs have began blocking any outgoing mail that doen't originate from there mailservers to try and cope with SPAM. Earthlink did it recently.

The fix is fairly simple. If your clients will go to the settings in there email client and change the outgoing SMTP server only and click on the button that says &my server requires authentication& it will work everytime. Sometimes just checking the &my server requires authentication& will do it on its own.

Just as a note, it's not a problem at all on your systems, its the clients ISP thats kicking back the message and blocking the mail. I lost a few clients figuring this out because they thought it was our problem until the switched host and had the same issue.

 

[Starhawk-cyberpixels]

What about the same problem with incoming?

I'm actually experiencing the same error message, but with inbound mail. i.e. mail accounts on the affected server are bouncing back all incoming messages with that same &no relaying allowed& error message.

I already thought that reverse DNS lookup was the issue and I commented out the &host_lookup& line in exim.conf. That didn't solve the problem unfortunately.

The only other thing I can think of that might be broken is the line:


host_accept_relay = +allow_address : lsearch;/etc/relayhosts : localhost

But I'm not really comfortable messing with that....

Input?

 

[Radio_Head]

look if you ips are listed on http://www.spews.org ?

 

[Website Rob]

Have the ones with problems first &check& their eMail before sending. Even with SMTP verification it sometimes doesn't work with Cpanel/Exim.

 

[Annette]

I believe the item that controls this is host_lookup. Generally, it's set to do lookups on all inbound IP requests:

host_lookup = 0.0.0.0/0

You could try commenting that out and restarting exim to see if that does the trick. The unable to find hostname from IP is getting to be more of a pain, especially from people trying to send from private networks where there is no PTR set for individual client machines.