Today I received the following error message while trying to send a message to an online store regarding my order with them:
TEMP_FAILURE: SMTP Error (state 8): 550 5.7.1 This system is configured to reject mail from xproxy.gmail.com (Host blacklisted in bl.spamcop.net)
I couldn't believe my eyes. Would a filtering organization actually blacklist the most important webmail provider in past years? Would a store operator actually use something as damaging and crude as a blacklist if their business relies on customer communication? It seems so.
Was this in error? I can't see any other explanation, but maybe someone could enlighten me?
(As a final touch of irony, gmail's spam filtering sent the SpamCop registration email straight to the spam folder, the first misidentified message I've had in months of using gmail)