Yahoo/BT email deferring issues

h'ola

We've been experiencing some problems sending emails to any "@btinternet.com" email address (and presumably yahoo ones as well)

Has anyone had any similar issues with BT/Yahoo emails? I'm getting grief from employer and clients that they can't send emails to BT addresses, but as far as I'm concerned it's out of my hands.

I'd prefer not to post any site addresses but I can assure you that none are black listed. Our hosting company say it's BT/Yahoo strict filtering (which I'm inclined to agree with), and Yahoo are anything but useful.

We have a resellers account, and as a result a shared server for all of our sites, so it's likely that another site has been causing problems (speculation mind, but I take care to ensure our sites are well looked after).

Any suggestions to stop this from happening? Or similar experiences.

Thanks.

What are the mail logs saying for the connections? I believe Yahoo tend to use greylisting and also limit volume per N time period, but your logs will contain specific information on the cause. Yahoo are very good for issuing responses with direct links to the relevant documnetation on their site, if you are deferred or blocked for any reason.

2010-04-25 18:55:53 1O5L3d-000350-F6 == XXX@btinternet.com <XXX@XXX.com> R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host
2010-04-25 18:55:57 1O4roY-0000p0-I7 == XXX@btinternet.com <XXX@XXX.com> R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host


means nothing to me.

bounced messages contain:


Delay reason: SMTP error from remote mail server after initial
connection:
host mx1.bt.mail.yahoo.com [195.50.106.142]: 421 4.7.0 [TS02] Messages from XX.XXX.XX.XXX temporarily deferred - 4.16.56.1; see http://postmaster.yahoo.com/errors/421-ts02.html


literally have no clue. Probably even more difficult to diagnose without the IP/server but as stated would rather not post these

should note - i have filled ih those forms with relevant info. I don't believe our sites would be the cause of this, but who knows - are there any ways of tracing? As it's a shared it could be any number of sites for instance.

Considering looking at a dedicated but would prefer not to.

Any experience with say, an exchange server - would that possible eliminate this problem?

Click on that Yahoo link and you'll get your answer. Either some users have reported mail from your system as spam or you are sending what they term as excessive amounts, or some of the other hosts on your system have generated excessive/reported mail.

With regards to the Exchange question, how does one express a maniacal chuckle effectively? :D No is the answer to that question.