wp.pl email host users are not recieving email (user verfications/message notifications)

[PiotrGT1]

Users that use www.wp.pl as their email host are not recieving email - here are 3 cases (all users are hosted on wp.pl) - emails are sent from a gmail account using PHPmail, will a @granturismo.pl resolve the issue? The funny thing is that when I send from this gmail account to these wp.pl emails, all three users recieve them. How can I fix this so it works from the mass email sent from my forum?

[Zachery]

Does your webmaster email match the SMTP account being used to send the email?

[PiotrGT1]

It seems like its working when I have set my email to [email protected] - going from the same domain name although it still goes to the SPAM folder.

[Zachery]

Is that the same as the SMTP account? This is very important.