Greetings, I'm getting some inbound email attempts that I believe are legitimate from United Airlines that are being rejected due to:
May 9 12:55:38 tamriel postfix/smtpd[1221960]: warning: hostname o1.email.smallbusiness.mileageplus.com does not resolve to address 50.31.61.242 Tracking this back, near as I can tell, postfix is correct here in that 50.31.61.242 / 242.61.31.50.in-addr.arpa resolves to o1.email.smallbusiness.mileageplus.com but o1.email.smallbusiness.mileageplus.com doesn't seem to actually exist: dig o1.email.smallbusiness.mileageplus.com a ;o1.email.smallbusiness.mileageplus.com. IN A ;; AUTHORITY SECTION: smallbusiness.mileageplus.com. 600 IN SOA vndcdf-fs0000-gma3-vip.ual.com. ualipconfig.united.com. 40 10800 3600 2592000 600 Hopefully someone on here is from UA or knows how to get in touch with someone there who could like into fixing that. Thanks, Stephen
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