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Smtp Server Error 421

A colleague of mine has encounters errors like: An unknown error has occurred. Account: ‘mail.different.bg', Server: ‘mail.different.bg', Protocol: SMTP, Server Response: ‘421 Cannot connect to SMTP server 212.70.124.241 (212.70.124.241:25), connect error server error 421 sending email 10060', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67 while he was trying 421 cannot connect to smtp outlook 2010 to send some emails with his Outlook Express mail client on his desktop computer running Windows XP, since he is not too 421 cannot connect to smtp server outlook much computer literate he contacted me for help on what is causing the error and how he can get through the issue and send the prepared emails to the destinations ASAP. After I have asked him 421 cannot connect to smtp server connect error 10060 a few questions necessary to better understand the status of the problem and where does it originated I have come to the conclusion that it's very likely that his outgoing SMTP port (25) outgoing TCP/IP traffic passing through the Internet Service Provider is filtered. When the 421 Cannot connect to SMTP server problem occured, he was actually in his parents house provided with an internet connection through a BTC ADSL see BTC (Vivacom)'s

421 Cannot Connect To Smtp Server Connect Error 10061

ADSL page for reference I have instructed my friend to try connecting to the SMTP (25) port of the questionable email server using window's telnet client i order to check if my assumption that the outoging SMTP 25 port traffic is filtered. I instructed him to issue a command like which is so common this days and it's not news to the Sysadmins out there: cmd> telnet mail.server.net 25 This prooved my theory that the 421 Cannot connect to SMTP server was caused by a filtered traffic on the outgoing network STMP port (25). Some Internet Providers out there has that annoying practice of filtering the outgoing SMTP connections, because they couldn't deal with infected Windows computers who start acting as a SPAM networks in another more clever way, however I should admit this is pretty dumb, since it creates numerous problems to the end user like in this particular case. The temporary work around for him that I suggested was to use the mail server Webmail Interface before he moves back with his notebook back to his ISP at home which doesn't include such a foolish way to filter spammers. Share this on

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reply codesSometimes your SMTP server may return a particular error message. The problem is that it will generally be very cryptic, like "550 Requested action not taken: mailbox unavailable" or "421 Try again later". What does these numbers mean?First of all: http://www.serversmtp.com/en/smtp-error not any reply code is an error. Sometimes it's just a response containing a detail about the server or an answer to a command. Secondly: any code consist of three digits, and each conveys a particular information. The first https://forums.cpanel.net/threads/421-smtp-server-error-too-many-concurrent-sessions-please-try-again-later.54893/ one defines whether the server has accepted the command, fulfilled an action, run into a temporary issue, encountered an error etc; the second and the third one refine the description further, stating if there's been a syntactic problem, smtp server or a connection trouble etc.Unfortunately, different servers sometimes use these codes in a different way, making the whole thing even more complicated... Anyhow, the most critical series of error messages is the 5xx one, and especially the ones from 550 to 559. In particular, you will probably get a lot of 550 SMTP error codes – that is, a problem that concerns the recipient's email address.Finally, remember that it's much easier to deal with these error 421 cannot connect codes if you choose to rely on a professional SMTP server that will help you solve any issue. turboSMTP, for instance, comes with a 24/7 customer support: you can try it free and forget once for all these issues.And here's a list of the main SMTP error or reply messages, with an explanation and a tip about what to do. CODEMEANINGHOW TO SOLVE IT / WHAT TO DO101The server is unable to connect.Try to change the server's name (maybe it was spelt incorrectly) or the connection port.111Connection refused or inability to open an SMTP stream.This error normally refers to a connection issue with the remote SMTP server, depending on firewalls or misspelled domains. Double-check all the configurations and in case ask your provider.211System status message or help reply.It comes with more information about the server.214A response to the HELP command.It contains information about your particular server, normally pointing to a FAQ page.220The server is ready.It's just a welcome message. Just read it and be happy that everything is working (so far)!221The server is closing its transmission channel. It can come with side messages like "Goodbye" or "Closing connection".The mailing session is going to end, which simply means that all messages have been processed.250Its typical side message is "Requested mail action okay completed": meaning that the server has transmitted a message.The oppsite of an error: everything has worked an

Plans & Pricing Partners Support Resources Preview Forums Forums Quick Links Search Forums New Posts Search titles only Posted by Member: Separate names with a comma. Newer Than: Search this thread only Search this forum only Display results as threads More... Useful Searches Recent Posts Resources Resources Quick Links Search Resources Most Active Authors Latest Reviews Feature Requests Defects Menu Log in Sign up The Community Forums Interact with an entire community of cPanel & WHM users! cPanel Forums > cPanel & WHM® (for Linux® Servers) > E-mail Discussions > This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More. 421 SMTP Server error: too many concurrent sessions, please try again later. Discussion in 'E-mail Discussions' started by Jeff75, Jul 5, 2006. Jeff75 Well-Known Member Joined: Apr 11, 2003 Messages: 555 Likes Received: 0 Trophy Points: 16 Does anyone know what would cause this error "421 SMTP Server error: too many concurrent sessions, please try again later.? Any idea how to fix it? I tried restarting the mail server but it keeps coming up from time to time for a certain user when he sends mail. #1 Jeff75, Jul 5, 2006 webignition Well-Known Member Joined: Jan 22, 2005 Messages: 1,880 Likes Received: 0 Trophy Points: 36 Jeff75 said: 421 SMTP Server error: too many concurrent sessions, please try again later.Click to expand... This error seems rather self-explanatory - connections to the SMTP server are being rejected due to there already being X number of connections from the same IP. Have you investigated the case that the user simply has too many open connections to the SMTP server? Jon Cram Web and interface design http://webignition.net/ Hosting Reborn (free cpanel accounts) http://hostingreborn.com/ #2 webignition, Jul 6, 2006 Jeff75 Well-Known Member Joined: Apr 11, 2003 Messages: 555 Likes Received: 0 Trophy Points: 16 I wasn't sure if this was either from too many users (total on the server) connecting to it, them sending out too many emails within an hour, or from them checking their email too many times. Here are my settings in WHM: The maximum each domain can send out per hour (0 is unlimited):160 he number of times users are allowed to check their mail using pop3 per hour. Zero is unlimited:180 #3 Jeff75, Jul 6, 2006 Gopi Member Joined: Aug 2, 2007 Messages: 19 Likes Received: 0 Trophy Points: 1 Hi Jeff, Where to set this???

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