I'm having problems with the mailing of the Webform Module.
I have an online website where you can fill in a form. The results will be sent to the email-address the user gave in and the user of the site.
When the user fills in an email like
email@example.com there are no problems. They receive the results perfectly. But when they use a gmail address like
firstname.lastname@example.org they DON'T receive the email. So it never works with a Gmail address.
The user of the site (who normally also receives the results) then gets an error like this:
Subject: Undelivered Mail Returned to Sender
This is the mail system at host myhost.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system
: host gmail-smtp-in.l.google.com[ip-adres] said: 550-5.7.1 [ip-adres 12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. 44si1984154eef.10 - gsmtp (in reply to end of DATA command)
What could be the problem with this?