Hi, Emails from united are getting rejected by our postfix mailserver. The mails seem to be from United Airlines (Mileage Plus).
Jan 20 19:16:45 mta01 postfix/postscreen[126746]: CONNECT from [50.31.61.242]:47664 to [xxx.xxx.xxx.xxx]:25 Jan 20 19:16:45 mta01 postfix/postscreen[126746]: WHITELISTED [50.31.61.242]:47664 Jan 20 19:16:45 mta01 postfix/smtpd[126747]: warning: hostname o1.email.smallbusiness.mileageplus.com does not resolve to address 50.31.61.242: Name or service not known Jan 20 19:16:45 mta01 postfix/smtpd[126747]: connect from unknown[50.31.61.242] Jan 20 19:16:46 mta01 postfix/smtpd[126747]: Anonymous TLS connection established from unknown[50.31.61.242]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) Jan 20 19:16:47 mta01 policyd-spf[126752]: prepend Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=50.31.61.242; helo=o1.email.smallbusiness.mileageplus.com; envelope-from=bounces+6242581-cfae-recei...@domain.tld@em7341.united.com<mailto:envelope-from=bounces+6242581-cfae-recei...@domain.tld@em7341.united.com>; receiver=<UNKNOWN> Jan 20 19:16:47 mta01 postfix/smtpd[126747]: NOQUEUE: reject: RCPT from unknown[50.31.61.242]: 450 4.7.1 <o1.email.smallbusiness.mileageplus.com>: Helo command rejected: Host not found; from=<bounces+6242581-cfae-recei...@domain.tld@em7341.united.com<mailto:bounces+6242581-cfae-recei...@domain.tld@em7341.united.com>> to=<recei...@domain.tld<mailto:recei...@domain.tld>> proto=ESMTP helo=<o1.email.smallbusiness.mileageplus.com> Jan 20 19:16:47 mta01 postfix/smtpd[126747]: disconnect from unknown[50.31.61.242] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6 Anyone here from united ? Or anyone has an idea what I can do to make them pass without opening my mailserver to all other wrongly configured domains ? KR Daniel
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