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Mail stuck in queue - connection refused?

Louis-M

I've just looked at the mail spool and was alarmed to see 18 mails stuck in there with subjects like "test email", "test" etc from clients within our network going to important external clients. Obviously our internal users know there is something wrong with delivery hence the titles of the mail.


For this particular domain they are sending to, I'm getting:

2016-04-25 15:16:08 XXXXX@XXXXX.uk R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host 
2016-04-25 18:02:45 mail.YYYYY.uk [150.70.226.147]:25 Connection refused 
2016-04-25 18:02:45 XXXXXX@XXXXXX.uk R=dnslookup T=remote_smtp defer (111): Connection refused 
2016-04-25 18:08:27 mail.YYYYYY.uk [150.70.226.147]:25 Connection refused 
2016-04-25 18:08:27 XXXXXXX@XXXXXX.uk R=dnslookup T=remote_smtp defer (111): Connection refused 
2016-04-25 18:21:16 mail.YYYYY.uk [150.70.226.147]:25 Connection refused

So, it's resolving the mail server and for some reason looks to get refused. I'm not on any blacklists and checking the mxrecords etc, we are set up fine. 99% of other mail
is getting delivered (both in and out)

I do however, have a couple of other domains that behave like this.


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  • 0 in reply to vilic

    Definitely not on any blacklists. It's a very strange problem.

    We are also encountering other issues which seem a little strange with it.

    For instance:

    2016-04-26 14:03:38 SMTP error from remote mail server after RCPT TO:<joe.bloggs@remote.maildomain.uk>: host host remote.mail.server [123.62.5.172]: 550 Your mail account has been blacklisted from sending e-mails. KB17293
2016-04-26 14:03:38 joe.bloggs@remote.maildomain.uk P=<joe.bloggs@remote.maildomain.uk> R=dnslookup T=remote_smtp: SMTP error from remote mail server after RCPT TO:<joe.bloggs@remote.maildomain.uk>: host remote.mail.server [123.62.5.172]: 550 Your mail account has been blacklisted from sending e-mails. KB17293

    Which is strange because we aren't blacklisted and we can send mail from others internal users to the other domain

    Our setup is:
    Incoming: INTERNET > UTM SMTP Proxy > EXCHANGE
    Outgoing: EXCHANGE Send connector > UTM SMTP Proxy > INTERNET

    Mail to most (not all) other domains flows fine (in & out)

    Another thing we have noticed is we have a distribution group on exchange eg xxx@yyy.com
    That distribution group has 4 internal recipients & 4 external recipients.
    When we use an internal address, mail goes out to everybody in that distribution group.
    When we use an external address to mail that distribution group, mail only goes to the internal users and the external users get bounced at the UTM

    Exchange does its part and sends to all but the UTM seems to bounce the external mail due to it coming from an external contact?

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