Update smtp config: add port number and disable ssl certificate validation

[fhp]

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Warnings

• This PR will change existing database contents.
• This PR introduces a breaking change to existing installations.

Summary

This PR adds two config options for the SMTP server. I needed to configure the SMTP port, and I found another issue that needed the SSL verification disabled.

Linked issues

resolves #2380

Description of changes

I added two config setting:

• SMTP_PORT can be used to set the port for the smtp server. It configures the config.action_mailer.smtp_settings.port field if set.
• SMTP_VERIFY_SSL_MODE can be set to none to disable the checks of the ssl certificate of the SMTP server. It configures the config.action_mailer.smtp_settings.openssl_verify_mode field if set.

[Floppy]

Thanks very much!

[Floppy]

@fhp I'm going to change the name of SMTP_VERIFY_SSL_MODE to SMTP_OPENSSL_VERIFY_MODE if you don't mind, for consistency. I'm adding the rest of the settings too in order to help fix #3391.

[fhp]

I don't mind, I just added it because there was an open issue for it.

[Floppy]

@fhp and it's much appreciated! ❤️