mailing system and spam issue - by: Civette

Hi,

Well I bet I'm in an unappropriate section but haven't found a better place.

I have an issue I guess will not be fixed here but you may help. Basically any invitation / reminding / confirmation mail sent from my limesurvey is tagged as spam when sent to Gmail. I took following steps :

- automated email, one or many, sent from LS to gmail -> spam ( thus send by the web server throught php mail function )
- any email sent from another SMTP to Gmail, but same sender address -> properly delivered ( alternate hosting company SMTP or third party SMTP both successfully tested )
- Gmail advice : please check mass mailing senders advices ( weird as mail is tagged as spam even when single sending )
- Hoster advice : "our SMTP is fine and not blacklisted, we would know it, please provide a copy of the code". I also asked them to create a SPF record but they can't. ( Some would say to change hosting but this is not the point by now )

This bring me to my question. Is the mail sending engine the phpmailer library ? and if yes from wher is it called ?

Thank you in advance