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ahumada.balcells.oscar@idc.cat: host aspmx.l.google.com[173.194.202.27] said: 550-5.7.1 The user or domain that you are sending to (or from) has a policy that 550-5.7.1 prohibited the mail that you sent. Please contact your domain 550-5.7.1 administrator for further details. For more information, go to 550 5.7.1 https://support.google.com/a/answer/172179 98e67ed59e1d1-2dd609bf566si1100502a91.105 - gsmtp (in reply to end of DATA command)