The use of the File Transfer Protocol (FTP) for "network mail" on the ARPANET was proposed in RFC 469 in March 1973. A further proposal for a Mail Protocol was made in RFC 524 in June 1973, which was not implemented. Mail on the ARPANET traces its roots to 1971: the Mail Box Protocol, which was not implemented, but is discussed in RFC 196 and the SNDMSG program, which Ray Tomlinson of BBN adapted that year to send messages across two computers on the ARPANET. SMTP grew out of these standards developed during the 1970s. Government's ARPANET, standards were developed to permit exchange of messages between different operating systems. As more computers were interconnected, especially in the U.S. Users communicated using systems developed for specific mainframe computers. Various forms of one-to-one electronic messaging were used in the 1960s. SMTP servers commonly use the Transmission Control Protocol on port number 25 (for plaintext) and 587 (for encrypted communications). The protocol version in common use today has extensible structure with various extensions for authentication, encryption, binary data transfer, and internationalized email addresses. It has been updated, modified and extended multiple times. SMTP's origins began in 1980, building on concepts implemented on the ARPANET since 1971. For retrieving messages, IMAP (which replaced the older POP3) is standard, but proprietary servers also often implement proprietary protocols, e.g., Exchange ActiveSync. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing email to the mail server on port 587 or 465 per RFC 8314. Mail servers and other message transfer agents use SMTP to send and receive mail messages. Post questions, follow discussions and share your knowledge in the Community.The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. To get help and troubleshoot other Microsoft products and services, enter your problem here. If you can't sign in, click here.įor other help with your Microsoft account and subscriptions, visit Account & Billing Help. To contact us in, you'll need to sign in. If the self-help doesn't solve your problem, scroll down to Still need help? and select Yes. To get support in, click here or select on the menu bar and enter your query. If using POP doesn't resolve your issue, or you need to have IMAP enabled (it's disabled by default), contact GoDaddy support. If you're using a GoDaddy account, follow these instructions to reconfigure your GoDaddy account to use POP. For instructions about how to reconfigure your account to use POP, contact your email account provider. To resolve this, remove the connected IMAP account in and reconfigure it as a POP connection. If you use to access an account that uses a domain other than or you might not be able to sync your accounts using IMAP. Select This was me to let the system know you authorize the IMAP connection.Īttempt to connect to the account via your IMAP client.įor more information on how to use the Recent activity page, go to What is the recent activity page? Under Recent activity find the Session Type event that matches the most recent time you received the connection error and click to expand it. Go to /activity and sign in using the email address and password of the affected account. We’re working on a fix and will update this article when we have more information. You may receive a connection error if you configured your account as IMAP in multiple email clients.
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