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MailPlus Server setup with Dynu (Email Store/Forward & SMTP outbound relay)

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Yesterday I wasted the best part of the day with Mail Station. I followed this video and could send but not receive.
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View: https://www.youtube.com/watch?v=5NHC0BrWvY0&t=613s

In the end, as I needed less than 5 clients I decided to install MailPlus Server following this video and everything worked:
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View: https://www.youtube.com/watch?v=UoPVlKBcND0&t=2s

However, both of these videos instruct to use the Dynu 'SMTP outbound relay' and the 'Email Store/Forward' products/services. It seems that port 25 is not blocked by my ISP so I question why I need the 'Email Store/Forward' anyway (but would it be worthwhile having as a queue buffer in the event of a NAS outage?).

Following the instructions from the video(s) I added the following DNS records:
  • MX record - domain.co.uk 10 store1.dynu.com
  • MX record - domain.co.uk 20 store2.dynu.com
  • CNAME record - mail.domain.co.uk domain.co.uk
  • TXT(SPF) record - "v=spf1 a:relay.dynu.com ~all"
  • TXT record - mail._domainkey.relay.domain.co.uk - IN TXT "xxxxxxxxx and so on"
Some late night research on here (or so I thought) come up with a thread that detailed exactly what DNS records to use with Dynu and how to set up (might have been Mail Station though). I do remember that it said to check using Newsletters spam test by mail-tester.com and this come back with a variety of issues:
  • We didn't find a mail server (MX Record) behind your domain name relay.domain.co.uk.
  • You do not have a DMARC record
I cannot find the thread I was reading last night in either my history or doing a search on here, so just wondered if anybody could point me in the right direction for a definitive guide on correct DNS records and how to set up under MailStation Plus.
 
Conversing with ChatGPT, have tweaked some records as below:
  • TXT record - _dmarc.domain.co.uk v=DMARC1; p=none; rua=mailto:[email protected]; fo=1; ruf=mailto:[email protected];
  • TXT(SPF) record - "v=spf1 a mx ip4:168.235.95.80 include:dynu.com ~all"
 
I've been working on autodiscover today and added the following records:
  • SRV record - _autodiscover._tcp.domain.co.uk 3600 IN SRV 0 0 443 autonautics.co.uk
  • SRV record - _imaps._tcp.autonautics.co.uk 3600 IN SRV 10 0 993 autonautics.co.uk
  • SRV record - _submission._tcp.autonautics.co.uk 3600 IN SRV 10 0 587 autonautics.co.uk
I've also put an xml at:
  • /.well-known/autoconfig/mail/config-v1.1.xml
  • /Autodiscover/Autodiscover.xml
I had some limited success with Outlook and could inspect the certificate (after an error) and it had pulled the NAS 'default' certificate rather than the SSL certificate assigned to MailPlus Server but it then failed with an error after that.
 

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