issue with not receiving emails from joomla forms

[wannabecoder]

I am on Joomla ver 3.10.8 with PHP 7.4.33
I updated to Joomla 3.10.12 and also updated the plugins. For some reason few pages started giving errors and I also stopped receiving emails when the forms are submitted. I reset Joomla back to 3.10.8 by replacing the old site files but the issue with emails is still there. I do not receive emails when the forms are submitted. i am using default joomla forms through content-contact plugin. Can someone help me in fixing it?
The email configuration is correct as I can receive the test email successfully.

[AMurray]

I would have said to check the global configuration but I can't advise any more if you have done that and the test email works. One possibility, the email is received but being filter by your spam settings (in your email client).

How did you restore 3.10.8 from 3.10.12 by "replacing old files"? Did you restore a backup or copy files over the top of the 3.10.12 files? That action probably didn't do you any favours. You should have restored a backup, including restoring the database.

Off-topic but an important point to make: You're using out-of-date Joomla (3.x is long EOL - no support). PHP 7.4 is also end-of-life (no support). I would seriously consider migrating (at minimum) to Joomla 4.

[wannabecoder]

I copied the 3.10.8 files and deleted the 3.10.12 files. Unfortunately, I didn't have the old DB backup but after replacing the files, i went to Components > Manage > Database and clicked on 'Fix' to fix the DB.
I want to update to the latest version of Joomla but a little hesitant as the plugins setup by my developer many years back might not work with the new version and I don't want to eventually end up with a complete broken site. Once the email from forms issue is fixed, I'll plan on upgrading to the new version. Is there any other plugin that i can use with my existing forms for them to work?
I use to receive the emails from forms in spam earlier but at least I received them. Now, since i upgraded the components after core 3.10.12 update, it screwed up everything.

[pe7er]

These days, a common issue with non received emails, is missing anti spam measures like SPF, DKIM and DMARC records. Did you configure those correctly in the DNS for your domain name?

When your Joomla website uses PHP or Sendmail as mailer method in Global Configuration, your email messages does not contain the DKIM signature. Use STMP as mailer in Joomla instead.

Do you send your mail to an email address that automatically forwards the mail to a Gmail or Yahoo address? When you automatically forward your emails, then they don't have right DKIM signature and will be blocked.

[wannabecoder]

These days, a common issue with non received emails, is missing anti spam measures like SPF, DKIM and DMARC records. Did you configure those correctly in the DNS for your domain name?

When your Joomla website uses PHP or Sendmail as mailer method in Global Configuration, your email messages does not contain the DKIM signature. Use STMP as mailer in Joomla instead.

Do you send your mail to an email address that automatically forwards the mail to a Gmail or Yahoo address? When you automatically forward your emails, then they don't have right DKIM signature and will be blocked.

I receive the test mail successfully in the inbox. I believe the the headers, SPF, DKIM, DMARC are all set up just fine. I started having issue only after updating the components for which i had to roll back to previous version i.e. 3.10.8. I have setup the email in the forms as well where it should send the reply after the form is submitted. It is my site's custom domain. The issue seems to be something else.

[wannabecoder]

Any update from anyone?
Can you continue using the same forms with a different plugin?

[Per Yngve Berg]

Enable Debug in Global Configuration and log the communication with the SMTP Server.

https://docs.joomla.org/How_to_debug_SM ... n_Joomla_3