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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!
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<indicator name="Faults">[[File:Menu-email.svg|link=:Category:Email|30px|Back up to the Email Category]]</indicator>
<indicator name="Faults">[[File:Menu-emailadd.svg|link=:Category:Email Features|30px|Back up to the Email Features Category]]</indicator>
tertiary-mx.co.uk is our backup email server. It will accept email for a domain we handle email for and will queue messages and will attempt to deliver to the higher priority MX record.
*Invalid HELO
*Recipient domain is not one we handle email for
*Message size is over
*The server will 'greylist' hosts. It will always defer (cause a temporary delivery failure) messages/connections under the following circumstances:
*Sending host in a DNS
*Header syntax errors
*Recipient rejected by the primary MX (It does a call back to the primary MX if it is available)
==Queuing==
Messages will be attempted to be sent on to a higher priority (i.e. lower MX record) email server starting at every 15 minutes, and increasing over time to every 3 hours. It will carry on trying for 31 days before bouncing the message back to the sender.
===etrn===
To force tertiatry-mx to attempt to relay stored messages, telnet in on port 25 and issue an etrn command in the form of
etrn #your-domain.co.uk
For example:
$ telnet tertiary-mx.co.uk 25
Trying 2001:8b0:0:30::51bb:1e1d...
Connected to tertiary-mx.co.uk.
Escape character is '^]'.
220-relentless.aa.net.uk ESMTP Thu, 08 Sep 2016 09:30:29 +0100
220-Mail accepted subject to terms on http://www.andrews-and-arnold.ltd.uk/inboundemailterms.html
220 You are 2001:8b0:0::1
etrn #example.com
250 OK
quit
221 relentless.aa.net.uk closing connection
==Setup==
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