Message Delivery Failure - Anyone else having problems?

[licquorice]

If you are using the BT servers, there is no need (or ability) to add or amend an SPF record.

I presume you are authenticating with a @btinternet.com email address on the BT SMTP server.

[sbadger]

 @jingars  Sure, but it's inbound email that is affected by this, is your inbound email being forwarded by 123-reg ?

mail to   'you@yourdomain.co.uk'       123-reg forwards to   'yourbt@btinternet.com' ?

I think the SPF entry on your domain means 123-regs mail server is allowed to send on your domains behalf.

[harveyzone]

Ok, I have just received a Message Delivery Failure message which the headers show was sent at 

Date: 22 Apr 2021 09:05:16 +0000

which I believe is after the fix was put in place.

I have also added the following to DNS on reg123 for the domain in question

IN TXT "v=spf1 mx a ?all"

which may or may not be correct 😞

[harveyzone]

And now a second.
Date: 22 Apr 2021 10:10:10 +0100

[sbadger]

@jingars  I've done some more digging.  You can add

include:btinternet.com

to you SPF.

v=spf1 mx a ip4:94.136.40.163 a:mailex.mailcore.me include:btinternet.com -all

I've changed mine and will check over the next 24 hrs

[Roger1945]

Just set up the SPF record as advised above and sent a test message to myself at my 123.reg address. It arrived within 20 seconds. The similar test message I tried last night (before I added the SPF record) has still not arrived.

Maybe the problem is fixed? I'll report again if I get any more errors.

Thanks to the guys who provided the SPF ideas. Fingers crossed"!

[jingars]

@sbadger, thank you for your time on this - I have set my SPF to the same.

[harveyzone]

Thanks @sbadger - I have updated mine to this too. Lets see if I get any more failures!

[TimSGX]

@NeilO 

Sorry but your response is not a sufficient explanation.  What is that changed on or around 7 April that has caused this problem?  

[davidneill]

I am also having this problem and it is getting to be a real problem.

My emails are diverted from my own domain address to my BT account. I have not noticed this problem with emails that are sent directly to my BT email address, only with diverted emails.

I have raised this with my domain provider and they have not yet responded.