osdir.com/ml/mail.ims.general/2007-09/msg00093.html‎CachedWe have an application that says that it can use SMTP-AUTH to send e-mail. .

sd-64701.dedibox.fr/page/news/smtp-554-5.5.0‎Cachedsmtp 554 5.5.0 - just-like.net. . NDR message #5.5.0 smtp;554 email address…

forums.isaserver.org/fb.aspx?m=2002039403‎CachedX-Supplementary-Info: <isa-1.intralink.local #5.5.0 smtp;521-EHLO/HELO from

shebangme.blogspot.com/2010/01/smtp-error-codes.html‎CachedSimilarJan 15, 2010 . NDR codes like 5.5.0 or 4.3.1 may remind you of SMTP errors 550 and 431.

www.mailerq.com/documentation/smtp-reply-codes‎CachedThe list below is a standard list with the SMTP reply codes according to the SMTP

www.chicagotech.net/exchange.htm‎CachedSimilar. with Screenshots AOL email gets 521 5.2.1 Service unavailable .

www.logsat.com/spamfilter/forums/forum_posts.asp?TID=107‎CachedA message "521 Server does not accept mail" is sent instead. I had this .

forums.msexchange.org/521_Server_does_not. mail/. /tm.htm‎CachedThere was a SMTP communication problem with the recipient's email . w2ksbs1.

www.pimlicosoftware.com/oldinvalidemails-2007.htm‎CachedSimilar{YouremailName}@earthlink.net SMTP error from remote mailer after RCPT> . .

craftmind.com/blog/assp-and-other-mail-bounce-back-number/‎CachedFeb 20, 2012 . NDR codes like 5.5.0 or 4.3.1 may remind you of SMTP errors 550 and 431.

social.technet.microsoft.com/Forums/. /en. /bounce-back-mail‎CachedSimilar5.5.0 smtp;521-blocked by sbc:blacklist.mailrelay.att.net . is to route email for

www.westernseakayakers.org/wskmaster.txt. SMTP; 553 5.3.0 nlpi027 - n315n3GP029472, DNSBL:ATTRBL 521< . .

www.winvistatips.com/. /comcast-and-aol-email-smtp-errors.631061/‎CachedMy SBS Exchange server will attempt the SMTP connection for several days and

www.linuxquestions.org/. /remote-protocol-error-sendmail-748389/‎CachedSimilarSMTP DATA-2 protocol error: 571 Delivery not authorized, message refused . [

www.dslreports.com/. /r16539272-Spam-Mail-from-outside-domain-being- blocked-by-comcast-There was a SMTP communication problem with the recipient's email server. .

microsoft.public.windows.server.sbs.narkive.com/. /exchange-delivery-error -message‎CachedThere was a SMTP communication problem with the recipient's email server. . <

www.electrasoft.com/faq/faq32be.htm‎CachedSimilarDec 18, 2009 . How can I learn everything I need to know about my SMTP email server? Where

www.alexmilla.net/codigos-de-respuesta-de-smtp/‎CachedSimilarDec 7, 2010 . SMTP codes that the message security service simply passes on behalf of

www.antionline.com/showthread.php?274559-Certain-emails-do. ‎CachedLOCAL #5.5.0 smtp;521-EHLO/HELO from sender **.**.***.*** does not map to

code.google.com/p/honeyd/source/browse/trunk/honeyd/. /smtp.pl?r=2‎SimilarMar 13, 2007 . 521. 522. 523. 524. 525. 526. 527. 528. 529. 530. 531. 532. 533. 534. 535. 536.

www.sorkincomputer.net/SMTP%20errors.htm‎CachedSimilar<mail.sorkincomputer.net #5.5.0 smtp;552 Requested action not taken: exceeded

https://forums.att.com/t5/Email-Internet-Security/. /3899515‎CachedFeb 19, 2014 . host scc-mailrelay.att.net [204.127.208.75]: 521-96.8.125.49 . . <(

www.experts-exchange.com/Software/Server. /Email. /Q_21992902.htmlSep 17, 2006 . <acsportland.com #5.5.0 smtp;521-EHLO/HELO from sender 64.122.41.188 does

https://forums.freebsd.org/viewtopic.php?t=44087‎CachedSimilarSMTP DATA-2 protocol error: 521 5.2.1 : AOL will not accept delivery of this

www.ecdoe.gov.za/. /AnswersThatWork-SMTP_Server_Error_and_Status_ Codes.pdf‎SimilarSep 12, 2010 . Error Codes or SMTP Reply Codes), or emails will be returned to the sender with

www.usglobalsat.com/forum/index.php?topic=4693.0‎Cachedbut the system showed "<mail.globalsat.com.tw #5.5.0 smtp;521-220.128.207.68

www.emaildiscussions.com/showthread.php?t=15392‎Cachedxxxxxxxx@bellsouthim.net.ec; Failed; 5.5.0 (other or undefined protocol .

support.freeforums.org/viewtopic.php?t=60120‎CachedSimilar554 5.5.0 No recipients have been specified. . while talking to . Diagnostic-

https://groups.google.com/d/topic/microsoft.public. /8rN-ckVu3q4‎CachedMar 7, 2007 . <YOUROLDDOMAIN.com #5.5.0 smtp;521-EHLO/HELO from sender

hintsforums.macworld.com/showthread.php?t=76748‎Cached521 5.2.1 Fatal failure of WOA 554 5.5.0 Remote protocol error. Reporting-MTA:

forum.neptunesystems.com/archive/index.php/t-660.html‎CachedSimilarAquaController> SMTP: smtp.aol.com unkn host for aol mail and AquaController>

www.tech-archive.net/Archive/Exchange/. 05/msg03585.html‎CachedMay 25, 2006 . There was a SMTP communication problem with the recipient's . <

www.iana.org/assignments/smtp. /smtp-enhanced-status-codes.xhtml‎CachedMay 29, 2008 . Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry . . X.1.10

sourceforge.net/p/webmake/mailman/attachment/. com/2/‎CachedSep 4, 2003 . . 4 Sep 2003 07:50:52 -0400 (EDT) Final-Recipient: RFC822; kjmedia@

www.coldnet.net/tech/SMTPCodes.htm‎CachedSimilarCheck your smart host setting on the SMTP connector. For example, check . 5.5.

community.spiceworks.com/. /558311-exchange-2010-outbound-tls-when- using-a-smarthost‎CachedAug 11, 2014 . There's an option in the McAfee configuration to require TLS on that first leg, but

forums.cpanel.net/. /off-site-mail-server-how-setup-reverse-dns-71542.html‎CachedSimilar<customerdomain.com #5.5.0 smtp;521-EHLO/HELO from sender CUSTOMERIP

blogs.msmvps.com/bradley/. /more-on-sbc-pacbell-yahoo-weirdness/‎CachedMar 20, 2008 . SBC Yahoo is now requiring SSL connections for SMTP and POP3. . <domain.

support.microsoft.com/kb/300171‎CachedSimilarExchange server cannot deliver SMTP messages to certain Internet domains. .

www.minasi.com/forum/topic.asp?TOPIC_ID=18937‎CachedThere was a SMTP communication problem with the recipient's email . #5.5.0

https://help.maximumasp.com/. /can-you-manage-reverse-record-my-ip- issued-from-my-isp.aspx‎CachedThere was a SMTP communication problem with the recipient's email server. . <

archiver.rootsweb.ancestry.com/th/read/Listowners/. /1100586729‎CachedNov 16, 2004 . by mta188.mail.re2.yahoo.com with SMTP; Mon, 15 Nov 2004 . (reason: 521

forums.comcast.com/t5/E-Mail-and-Xfinity. /423893‎CachedMay 23, 2006 . There was a SMTP communication problem with the recipient's email . <*****.le-

www.prestashop.com/es/versiones-para-programadores/. /1.5.5.0‎CachedSimilarv1.5.5.0 - (2013-08-22) # . . BO : fixed bug #PSCFV-5838 Advanced

www.knowoutlook.com/. /381289-521-server-does-not-accept-mail.html‎Cached521 Server Does Not Accept Mail - Let me begin by saying that this is not a .

www.tech-forums.net/. /need-help-fixing-email-rejection-notification-i-keep- getting-148019/‎Cached<mail.nationalsalesco.com #5.5.0 smtp;521-EHLO/HELO from sender 12.104.

ms-exchange.questionfor.info/q_exchange-server_1683.html‎CachedMay 17, 2008 . You will need to enter exch2k3.us.abc.com in the FQDN of your smtp vs. not us.

productforums.google.com/d/msg/gmail/. /a9OuzNLpiSUJ‎CachedJul 9, 2009 . Status: 5.5.0. Diagnostic-Code: SMTP; 521-207.115.36.121 blocked by ldap:ou=

www.justanswer.com/email/786gt-ra-rfb.html‎CachedSimilarDATA <<< 521 5.2.1 : (CON:B1) http://postmaster.info.aol.com/errors/554conb1.

forums.networksolutions.com/nsmail-announcements-f111-returned-mail- t10980.html‎CachedSimilar554 5.5.0 Remote protocol error . Diagnostic-Code: SMTP; 521 5.2.1 : (CON:B1)

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