Après une conversation d'une douzaine de messages échangés...

"This is the mail system at host mail.hoa.ro.

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

xx@gmail.com: host gmail-smtp-in.l.google.com[173.194.70.27] said:
550-5.7.1 [88.191.184.77 7] 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. s8si32050323ees.148 - gsmtp (in reply to end of
DATA command)"