Why not? They say they can on their website, so why can't they?
Lots of companies now close port 25 by default and people have to ask to open them. Contabo is indeed a good choice.
Opened a contabo account and got an ip which is not blacklisted, now the issue is on sending mails to gmail accounts, am getting this error
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
[email protected]
host gmail-smtp-in.l.google.com [74.125.71.27]
SMTP error from remote mail server after end of data:
550-5.7.26 This mail has been blocked because the sender is unauthenticated.
550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
550-5.7.26
550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass
550-5.7.26 SPF [domain.com] with ip: [my ip] = did not pass
550-5.7.26
550-5.7.26 To mitigate this issue, please visit Gmail's authentication guide
550-5.7.26 for instructions on setting up authentication:
550 5.7.26
https://support.google.com/mail/answer/81126#authentication d13-20020adfef8d000000b0032d8fdc588esi751926wro.58 - gsmtp
Reporting-MTA: dns; vmi151349.contaboserver.net
Action: failed
Final-Recipient: rfc822;
[email protected]
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 This mail has been blocked because the sender is unauthenticated.
550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
550-5.7.26
550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass
550-5.7.26 SPF [domain.com] with ip: [my ip] = did not pass
550-5.7.26
550-5.7.26 To mitigate this issue, please visit Gmail's authentication guide
550-5.7.26 for instructions on setting up authentication:
550 5.7.26
https://support.google.com/mail/answer/81126#authentication d13-20020adfef8d000000b0032d8fdc588esi751926wro.58 - gsmtp