I've switched hosts and the new host's smtp server seems to be rejecting the email I'm trying to send to a group. It can me 2 or 2000 people with the same response. Apparently it does not like the auto generated sender email address? Anyone have that issue and go I d a solution? CiviCRM on WordPress. Both very recent versions.
2017-09-22 16:30:04 [4342] H=(www.sportingdetectiondogs.ca) [184.154.247.100]:33676 I=[184.154.247.116]:25 X=TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no SNI="sportingdetectiondogs.ca" F= A=dovecot_login:civicrm@sportingdetectiondogs.ca rejected RCPT : SITEGROUND: b.304.14831.47c90fe51b65dc14@sportingdetectiondogs.ca is not a valid address: Sender verify failed: Sender verify failed 2017-09-22 16:40:04 [48178] H=(www.sportingdetectiondogs.ca) [184.154.247.100]:42556 I=[184.154.247.116]:25 Warning: SITEGROUND: Message from 184.154.247.100. Normal SMTP auth with civicrm@sportingdetectiondogs.ca system user: sporti62 2017-09-22 16:40:04 [48178] H=(www.sportingdetectiondogs.ca) [184.154.247.100]:42556 I=[184.154.247.116]:25 X=TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no SNI="sportingdetectiondogs.ca" F= A=dovecot_login:civicrm@sportingdetectiondogs.ca rejected RCPT : SITEGROUND: b.304.14832.46cd2e439db32d78@sportingdetectiondogs.ca is not a valid address: Sender verify failed: Sender verify failed 2017-09-22 18:45:24 [26529] H=(www.sportingdetectiondogs.ca) [77.104.151.189]:51718 I=[77.104.151.189]:465 Warning: SITEGROUND: Message from 77.104.151.189. Normal SMTP auth with civicrm@sportingdetectiondogs.ca system user: sporti62 2017-09-22 18:45:24 [26529] 1dvXdM-0006tt-Ja <= info@sportingdetectiondogs.ca H=(www.sportingdetectiondogs.ca) [77.104.151.189]:51718 I=[77.104.151.189]:465 P=esmtpsa X=TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no SNI="usm31.siteground.biz" A=dovecot_login:civicrm@sportingdetectiondogs.ca S=565 M8S=0 T="Test for SMTP settings" from for support@siteground.com support@support.com [~]#