Email wont send after wp 5.5. update

Here is the diagnostic.
Mailer: postsmtp
HostName: 3depo.com
cURL Version: 7.29.0
OpenSSL Version: NSS/3.44
OS: Linux vps.somuchip.com 3.10.0-1062.9.1.el7.x86_64 #1 SMP Fri Dec 6 15:49:49 UTC 2019 x86_64
PHP: Linux 7.3.13 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 5.5 en_AU UTF-8
WordPress Theme: threedepo
WordPress Plugins: 3DEPO, Ultimate Addons for Visual Composer, WPBakery Page Builder, Post SMTP, WPS Hide Login
WordPress wp_mail Owner: /home/admin/web/3depo.com/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
WordPress phpmailer_init Action(s): PostsmtpMailer->phpmailer_smtp_init
Postman: 2.0.14
Postman Sender Domain (Envelope|Message): 3depo.com | 3depo.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: SMTP (smtp:tls:login://vps.somuchip.com:587)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 129 | 0
Postman Stealth Mode: Yes

Not sure what you mean. What save button you mean?

So the test mail from the backend works on but all the emails in my own plugin example:

wp_mail( $user[’email’], $subject, $message, $headers );

these fail with the error I provided earlier.

Very strange. Can you assist to find a solution?

Ok. I’ve pressed save settings and nothing strange. All settings are saved. No error on the backend.

My header array in the wp_mail function in my code has only ‘Content-Type: text/html; charset=UTF-8’,’BCC: ‘.$settings[’email_address’].”

I think the issue is the FROM email is not parsed properly in your plugin by the getFromEmailAddress().

Update…Adding the FROM in the WP_mail header works when sending emails from backend but not for sending emails on frontend. Strange…

I don’t have user registration just some special types of emails in my own plugin. AS mentioned I simply use the WP_Mail function, nothing fancy.

Sorry but issue remains in version 2.0.15