Error Smtp 550 5.1.1

239 7742 Call Now My Account English Deutsch Espanol Francais Русский Українська Italiano Magyar Polski Portugues Brasil Svenska Turk Latin America Products Bulk Mailers Atomic Email Studio Atomic Mail Sender Email Extractors Atomic Email Extractor Atomic Lead Extractor Atomic Email Logger Atomic Web Spider Atomic WHOIS Explorer Atomic Newsgroup Extractor List Managers Atomic Email Verifier Atomic List Manager Atomic Subscription Manager Databases Atomic Web Catalogue Services Bulk Mailers Bulk SMS Sender Bulk Email Service SMTP Service For Mailing Lists Atomic Email Tracker Atomic Verifier Online Extras Custom Template Prices Benefits Features Knowledgebase Support Ask a question Video demo About us Our Company Contact us Our Benefits Success Stories Testimonials Blog Home SMTP for Atomic Email Marketing Software The 550 5.1.1 error message Note: SMTP error codes are not an exact science, because different servers can assign different meanings to the same error code. However, there are things that are likely to be true, and we are going to talk about them. You are reading this because you’ve received an automated message with a “550 5.1.1” error code in it. There are couple of things that could have caused this error: The recipient address does not exist: you may possess an outdated email that was valid at one time. There are typos in the recipient’s email address, which means that the address to which you are trying to send the email has never existed. If your MX record was changed, you may have an outdated DNS record and you were trying to resolve your MX record to an IP that no longer hosted it. There is something wrong with the configuration of the receiving server. How you can fix the 550 5.1.1 error Check the email for typos (sometimes they are quite obvious, for example: recipient.email@ggmail.com) and verify it. You can use an online tool that serves this purpose—there are lots of them on the Internet. Your DNS record is stale and cannot be resolved by the recipient server. It needs to be updated. Perform DNS lookup for your domain (DNS Lookup) and push the "Find problems" button. Consult the webmaster if you see any errors in the resulting list. If everything looks okay, or you get the same error when trying to send the email again, even though you are sure that the address exists and is typed correctly

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43 Mentions12 Products Neal (Exclaimer) Sales & Marketing Manager GROUP SPONSORED BY EXCLAIMER See more RELATED PROJECTS Exchange 2010 Upgrade Upgrade an aging Exchange 2003 environment to a newer Exchange https://community.spiceworks.com/topic/297095-550-5-1-1-user-unknown-when-sending-from-external-email-server 2010 environment using local storage. Google Apps for Business Migration Migrated entire company http://www.gettingemaildelivered.com/what-those-smtp-error-codes-mean-and-why-you-should-care from Exchange 2003 to Google apps for business Disaster Recovery aftrer Super Storm Sandy Executed successful Disaster Recovery plan during Super Storm Sandy which allowed employees to continue to work remotely while maintaining all data. Users were able to continue to work remotely for 2 months while the central TECHNOLOGY IN THIS DISCUSSION error smtp Microsoft 492005 Followers Follow Microsoft Exchange Server 2010 Apple Mail Join the Community! Creating your account only takes a few minutes. Join Now Delivery to the following recipient failed permanently:     recipient name@domain.co.uk Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain [domain name]by[exchange server dns name] [external ip]. The error that the other error smtp 550 server returned was: 550 5.1.1 User unknown Reply Subscribe RELATED TOPICS: 550 5.1.1 User unknown when sending from external email server How many non-I.T. people do you know that have an email server in their home? external email is down   1 2 Next ► 31 Replies Jalapeno OP Chris Francis Jan 30, 2013 at 12:36 UTC I have googled this error and checked that "require that all senders are authenticated" is unticked in the mailbox Message Delivery Restrictions. checked the email address in the mailbox email addresses tab - its ok I added a new email address to this tab and was able to send to this new address ok. Deleted and readded the email address which is the primary one and tried sending again - same error from hotmail or Gmail. Receiving internal email ok. All other users are receiving external email ok. Chris 0 Mace OP Jay6111 Jan 30, 2013 at 12:55 UTC Confused! You're trying to send from gmail to an address internal to your organization correct and it's getting bounced back? -Jay 1 Jalapeno OP Chris Francis Jan 30, 2013 at 5:18 UTC Hey, Hello again Jay. If

By Anne P. Mitchell, CEO - January 25, 2010 30 Summary: Anybody who sends email has seen them, in one form or another - those SMTP error codes, often returned in bounced email, such as "550 Requested action not taken: mailbox unavailable" or "550 5 2 1 mail from refused spam site." These are often in response to SMTP commands that have 'gone wrong' between your email server that sent the email, and the receiving email server that is unable to deliver it (or refuses to deliver it) for some reason. But what exactly do they mean? And why should you care? ('SMTP' stands for Simple Mail Transfer Protocol.) First, here is a list of SMTP messages and error messages, and what each message is supposed to say and mean Follow Us!Anybody who sends email has seen them, in one form or another - those SMTP error codes, often returned in bounced email, such as "550 Requested action not taken: mailbox unavailable" or "550 5 2 1 mail from refused spam site." These are often in response to SMTP commands that have ‘gone wrong' between your email server that sent the email, and the receiving email server that is unable to deliver it (or refuses to deliver it) for some reason. But what exactly do they mean? And why should you care? (‘SMTP' stands for Simple Mail Transfer Protocol.) First, here is a list of SMTP codes and error codes, and what each message is supposed to say and mean: 211 - A system status message. 214 - A help message for a human reader follows. 220 - SMTP Service ready. 221 - Service closing. 250 - Requested action taken and completed. 251 - The recipient is not local to the server, but the server will accept and forward the message. 252 - The recipient cannot be VRFYed, but the server accepts the message and attempts delivery. 354 - Start message input and end with .. This indicates that the server is ready to accept the message itself

421 - The service is not available and the connection will be closed. 450 - The requested command failed because the user's mailbox was unavailable (such as being full). Try again later. 451 - The command has been aborted due to a server error. (on their side) 452 - The command has been aborted because the server has insufficient system storage. Unfortunately, many receiving systems seem to mix and match these error messages, rather than adhering to the prescribed code me