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I did a fresh install of xoops 2.5.5 on my shared host. Everything seemed to work fine so far. As i installed "eforms" and submitted a form, i got the above error. To check, if it's a core oder module problem, i tried to register as new user and no mail was sent to.
I tried several settings. Sendmail also didn't work and with SMTPAuth all sent mails have been eaten by the spam filter. I also switched between differnt PHP-versions from 5.2.x to 5.3.x with no result.
My last attempt was to copy the complete /class/mail folder from a working xoops 2.5.1 to my 2.5.5 installation and - whoops! - it works!
So, what can be the problem here? Debug mode brings up no error. What are the main disadvantages using this "old" version of phpmailer class?