Hello,
Thank you for posting in Q&A forum.
To further check this issue, please kindly follow below steps:
1.Check if SMTP service is running properly on the destination server. Port 22 is used for SMTP serivce, if service is not running it can fail to telnet.
2.Check if SMTP related dependency services are running and can also try to restart the service.
To help other customers who may be facing the same issue, please don't forget to vote if the reply is helpful.
Best regards,
Jill Zhou