ATT net error
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xxx@prodigy.net SMTP error from remote mail server after MAIL FROM:: host al-ip4-mx-vip1.prodigy.net [144.160.235.143]: 553 5.3.0 alph141 DNSBL:ATTRBL 521< 50.18.116.53 >_is_blocked.__For_information_see_http://att.net/blocks