Why is SMTP blocked?


https://docs.digitalocean.com/support/why-is-smtp-blocked/

https://www.mailjet.com/blog/email-best-practices/how-to-use-sinch-mailjet-smtp-server/

https://www.digitalocean.com/community/questions/smtp-587-ports-is-closed

https://www.digitalocean.com/community/questions/how-to-unblock-smtp-ports-587-465-25-for-transactional-email-via-mailjet

https://www.mailjet.com/blog/email-best-practices/which-smtp-port-mailjet/


If you are using Mailjet, then you can use 2525 as your SMTP port

Test connectivity again

After adding the ports, try:

telnet in-v3.mailjet.com 2525

You should now see something like:

Trying 34.22.xxx.xxx...
Connected to in-v3.mailjet.com.
Escape character is '^]'.
220 in-v3.mailjet.com ESMTP Mailjet

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to close the above output

Type:

quit
and press Enter.

You should see:
221 Bye
Connection closed by foreign host.