SMTP Server Timeout when Configuring IMAP Client

Question

We use Amazon Workmail service in eu-west-1 region (Ireland) to send/receive email. However, we cannot use our IMAP software to read/send email locally because of timeout at the SMTP server.  
  
$ telnet imap.mail.eu-west-1.awsapps.com 993  
-> works fine  
  
$ telnet smtp.mail.eu-west-1.awsapps.com 465  
-> timeout  
  
This article is used as reference for the configuration: https://docs.aws.amazon.com/workmail/latest/userguide/using_IMAP.html  
  
Seemingly other users were facing the same problem in other region (ref: https://forums.aws.amazon.com/thread.jspa?threadID=329851&tstart=0 ). Would it be possible that there is a problem with the SMTP server / configuration reference page leading to this timeout error?

malops · Answer

Hi Robin,  
  
Thanks for the answer. It helps narrow down the real issue. Outbound port 465 was blocked by the infra provider. We have requested to unblock the port. The issue has been resolved.

robinkaws · Answer

Hi,  
  
I'm sorry to hear you're experiencing problems connecting to SMTP over telnet. I am not sure if that works so I will check in with the service team for that.   
  
What does work for me is using open_ssl:   
openssl s_client -connect smtp.mail.eu-west-1.awsapps.com:465 -servername smtp.mail.eu-west-1.awsapps.com  
  
Kind regards,  
Robin

SMTP Server Timeout when Configuring IMAP Client

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