Mail Server Error 421
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Smtp 421 Service Not Available
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Error 421 Outlook
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 smtp error 421 service not available 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? smtp error (421) connection to server failed 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
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421 is a common SMTP (Simple Mail Transfer Protocol) Outlook error message. MS Outlook http://errortools.com/en/outlook/fix-error-421/ is one of the best and popular email applications widely used by PC Windows users for sending and receiving emails within and outside workplaces. It is mostly commonly used in offices by professionals for the faster communication. This error may occur while sending and receiving emails on the server. The error 421 message is displayed error 421 in either of the following formats: “An unknown error has occurred: Server error 421” "Could not send your message. Error 421" 421 4.2.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html 421 4.3.1 Out of disk space for temp file 421 4.3.2 All server ports are busy 421 Downstream server error 421 Fork failed 421 Greylisting enabled, please try later service not available “An unknown error has occurred. Subject ‘Testing’, Account: ‘pop.charter.net’, Server: ‘mail.charter.net’, Protocol: SMTP, Server Response: ’421 Message rejected’, Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67” Solution Download available to completely repair Error 421 Recommended: Download the Outlook PST Repair Utility to safely recover email, calendar contacts and all PST data. Download Certified safe, virus free download. Error Tools Editor's Choice. Error Causes Some common causes for this critical Outlook error are: PST storage size exceeds 2GB file size Improper ISP settings Slow internet connection PST file corruption Trojan attack and viral infection This is a critical Outlook error which should be resolved timely. If you delay, it may cause you a great deal of inconvenience. The error code 421 hampers your ability to access your email account, send and receive emails, add new contacts, view emails, calendar entries and journals. In other words, it just brings your email activities to a standstill locking you out of the account. Further I