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<indicator name="Faults">[[File:Menu-email.svg|link=:Category:Email|30px|Back up to the Email 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.▼
<indicator name="Faults">[[File:Menu-emailadd.svg|link=:Category:Email Features|30px|Back up to the Email Features Category]]</indicator>
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==Spam Protection==
*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==
If you would like to use tertiary-mx.co.uk as a backup mail server for your domain please contact sales who will add the domain.
If you manage your own DNS server, once added at our end, then you'll want to add an entry similar to:
example.com MX 50 tertiary-mx.co.uk.
[[Category:Email]]
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