Resolved SMTP Mail Not Working

[sercan]

Hello there,
I'm having trouble sending mail for the plesk server I've set up on Google Cloud.

I know port 25 is closed in Cloud. For this reason, I checked the "Enable SMTP service on port 587 on all IP addresses" option in the mail settings and my 587 port is open.
My hostname setting is correct. I use the default Postfix and Dovecot as the mail server. It's plesk resolving the DNS and the MX records are correct.
I can't think of anything else to check. When I try to send an e-mail to the account I opened from the Plesk panel, I get a "Connection Error (Failed to reach the server)" error.

System Info:
CentOS Linux 8.5.2111
Plesk Obsidian Version 18.0.39

By the way, although the "Enable SMTP service on port 587 on all IP addresses" option is checked, it says that I need to open port 25 in the mail settings.
Thank you for giving a time.

 

[Bitpalast]

In order to send or receive mail on the Internet your server must open port 25, because all other systems on the Internet expect this as the mail transmission port. I think that through your Google console you should be able to open port 25.
Please also see Question - Need help to open port 25 Google Cloud

 

[sercan]

In order to send or receive mail on the Internet your server must open port 25, because all other systems on the Internet expect this as the mail transmission port. I think that through your Google console you should be able to open port 25.
Please also see Question - Need help to open port 25 Google Cloud

Hello there,
Thank you for your answer. Port 25 is already open but Google Cloud does not allow us to open port 25. I think the reason is to prevent sending spam mail.

 

[Bitpalast]

How to send email from a Plesk server on Google Cloud?

Applicable to: Plesk for Linux Plesk for Windows Question It is not possible to send email from a Plesk server on Google Cloud. Incoming mail is received successfully, but outgoing messages are ...

support.plesk.com

 

[sercan]

How to send email from a Plesk server on Google Cloud?

Applicable to: Plesk for Linux Plesk for Windows Question It is not possible to send email from a Plesk server on Google Cloud. Incoming mail is received successfully, but outgoing messages are ...

support.plesk.com

I created a SendGrid API following the instructions and connected it with Postfix. When I try to send mail, I get the error "smtp; 550 Unauthenticated senders not allowed".

 

[sercan]

How to send email from a Plesk server on Google Cloud?

Applicable to: Plesk for Linux Plesk for Windows Question It is not possible to send email from a Plesk server on Google Cloud. Incoming mail is received successfully, but outgoing messages are ...

support.plesk.com

Thank you, I understood the problem and now I have a new question.

Question - SendGrid Automation

Hello there, Since I installed Plesk on Google Cloud, I needed to set up a 3rd party mail service. I also installed SendGrid and started using it. But I have a problem; When I add a new domain to my Plesk server, I have to go to sendgird and perform "Sender Authentication". Can I have Plesk do...

talk.plesk.com