Why do emails sent through Domus bounce or not arrive?

When emails are sent using Domus, we send through our own mail server (not yours) on your behalf.  This can sometimes be regarded as 'spam' by the server that receives the emails.  Over time, this can lead to the emails being rejected by that mail server which is why emails are sent back to you (bounced) or sometimes appear never to have arrived as the receiving server just deletes them.

If this is happening to you, or if you want to make sure your emails get through then there is something that can be added to your domain records (otherwise known as DNS) that might help.  This is to add a Sender Policy Framework (known as SPF) record.

To add an SPF record (or amend an existing one) so that it includes our mail server information the following needs to be added (which covers all the IP addresses that the mail server may send from) a TXT record needs to be added to the domain with:

v=spf1 a:smtp.mistral.net a mx ip4: ip4: -all

If you already have an TXT record that contains an SPF record, or send emails yourself then you need to make sure that your email server is included in the record.  For example:

v=spf1 include:<YOURMAILSERVER> a:smtp.mistral.net a mx ip4: ip4: -all

(The IP address range provided covers a full set of servers from -

Please talk to your IT department or whoever manages your domain records to get this set up.  Once the change has been made, it can take up to 48 hours for the change to propagate across the internet. 

Topic: Admin

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