Connection timed out

[johnm1998]

I'm getting this errors in the stalwart hosted in docker when sending mails. Receiving emails are working. I found that port 25 is blocked and my vps provider is asking to use ports 465/587 instead of port 25. Is it possible to send mails without using port 25?
Below are the relevant logs

2024-12-18T15:53:44Z INFO Connection error (delivery.connect-error) queueId = 214447831980449799, from = "", to = [""], size = 1164, total = 1, domain = "gmail.com", hostname = "alt2.gmail-smtp-in.l.google.com", localIp = (null), remoteIp = 142.251.9.27, remotePort = 25, causedBy = SMTP error occurred (smtp.error) { details = I/O Error, reason = "Connection timed out (os error 110)" }, elapsed = 135149ms

[mdecimus]

Is it possible to send mails without using port 25?

No, outgoing emails can only be sent to port 25.

[mr-wizerd]

Hello, dynu.com offers an email store/forward service to use alternative ports, like 26 or 2525, for this issue (my current situation, as well). Is there a way to use this service to allow Stalwart to send email when port 25 is blocked?

A little more detail.

It changes the mx record and subsequently tries to connect to a different IP (dynu IP) on port 25, which it cannot: