SOLVED Email fails to send after migration - urgent help please

[bloatedstoat]

Hello,

I'm around 2/3rds the way through a server migration. I moved a bunch of accounts over the weekend that use email heavily.

At this stage most appear to have moved without issue but I have some that just refuse to accept mail from the sender and the email sits in the sender's outbox.

I'm trying to figure out why they won't send.

I have two nameserver host records defined at my registrar for the domain, my old server with accounts still on it serves as NS1.

I have a DNS Only machine NS2.

I have a new server which I am moving accounts to and the old server is proxying the requests.

Any pointers to try and solve this gratefully received, this is really really stressful.

Thank you.

 

[bloatedstoat]

Never mind. I've worked it out.

Basically the new server only accepts connections to send email on specific ports - secured ones with SSL/TLS.

If the ports are incorrectly set in the sender's device then the connection just drops and mail sits in the outbox.

 

[kodeslogic]

Glad that the issue is resolved.