Email fails to send after migration - urgent help please

bloatedstoat

• May 28, 2023 18:54

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.

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  bloatedstoat

  • May 29, 2023 02:25

  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.

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  kodeslogic

  • May 29, 2023 13:31

  Glad that the issue is resolved.

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