Dynamic:

 

You do have the option of asking Simpro for the address of the SMTP servers they use and add these into your SPF record to 'authorise' them for your domain.  This should not be new to them.  

 

 

Exactly, it's not like we are the first people to be doing this. We've asked them, they raised a ticket and we wait.

 

Dynamic:

 

You might be able to check message headers of previous Simpro invoice emails and find the server name yourself.

 

Again, it can feel a bit like a black art sorting things like this when one end of the equation is out of your control.  Yahoo / Xtra email has given us far worse trouble in the past than any other platform.

 

 

In the meantime this is what I'm doing. Anytime we see a bounced email I'm adding the server name to our SPF.

 

Dynamic:

 

Again, it can feel a bit like a black art sorting things like this when one end of the equation is out of your control.  Yahoo / Xtra email has given us far worse trouble in the past than any other platform.

 

 

That it is, and as you say I've had more trouble with Yahoo/Xtra than all the others put together over the years.