This is the below situation :
A customer fill in a form on our web site and have to specify his @mail.
Once the form validate, an entry is generated in our CRM.
A mail is sent to a specific internal @mail (recipient@mycompany.com)to inform us about a new entry in our CRM.
At 99% it is working fine but sometimes we have a 550 5.7.1 Sender ID (PRA) Not Permitted error
In smtp Logs (frontend) on our mail server i saw that :
2016-12-14T20:20:09.291Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,128,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,>,MAIL FROM:<sender@sender.com> SIZE=0 AUTH=<>,
2016-12-14T20:20:09.291Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,129,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,>,RCPT TO:<recipient@mycompany.com>,
2016-12-14T20:20:09.307Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,130,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,<,250 2.1.0 Sender OK,
2016-12-14T20:20:09.307Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,131,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,<,250 2.1.5 Recipient OK,
2016-12-14T20:20:09.307Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,132,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,>,DATA,
2016-12-14T20:20:09.307Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,133,@IPMYEXSERVER:46772,@IPMYEXSERVER:2525,<,354 Start mail input; end with <CRLF>.<CRLF>,
2016-12-14T20:20:26.916Z,Inbound Proxy Internal Send Connector,08D4080A26D0D42B,134,@IPMYEXSERVER46772,@IPMYEXSERVER:2525,<,550 5.7.1 Sender ID (PRA) Not Permitted,
Any idea to fix that?
Thanks