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https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365-mso_o365b/smtp-relay-to-office-365-just-stopped-working-with/6a4fcf28-0f8b-4318-9a89-ed0adb5688d7
Jun 30, 2018 · in SMTP relay. Anonymous authentication and MX record as smart host along with port 25. Message delivery to the host <removed by moderator for protecting your privacy> failed while delivering to the remote domain 'u*****.com.au' for the following reason: The remote server did not respond to a connection attempt.
https://support.google.com/mail/forum/AAAAK7un8RUBzd-xqcuodQ/?hl=en
Aug 29, 2011 · 500 Remote server does not support SMTP Authenticated Relay (state 6). I sent some eMails to my girlfriend's Yahoo! address (she uses the same setup as me, reads and writes eMails via GMail...only that I have a German Yahoo! account [ [email protected] ], while she has a Japanese one [ [email protected] ] ).
https://support.desk.com/customer/en/portal/articles/983029-smtp-and-imap-authentication-errors
When you use email in Desk.com, IMAP or SMTP is used to send or receive the email. Communication is opened between the Desk.com servers and your mail server, and Usernames and Passwords are used to authenticate the user. All IMAP servers require authentication, but some SMTP mail servers do not require authentication.
https://community.spiceworks.com/topic/681211-smtp-relay-to-office-365-not-working
May 14, 2018 · It actually does ... but not all the way. The messages get sent to the SMTP relay (that I put in the IIS on the backup server itself) server ... but they are not forwarded to the Office 365. They are stuck in the "C:\inetpub\mailroot\Queue" folder.3.9/5(333)
https://www.gammadyne.com/relaying_denied.htm
If the mail server is on a Local Area Network, it may be necessary to specify the mail server's local IP address, not its name. If the mail server belongs to your ISP , it is possible that the mail server will only relay mail for users that are currently connected to the ISP.
https://serversitters.com/how-to-correct-554-5-7-1-relay-access-denied-email-errors-and-prevent-them-in-the-future.html
Oct 11, 2016 · The first thing you should do is verify your email settings with your email provider. Make sure you have the proper Mail server, Username, and Password. Also, check whether or not you need to use SMTP Authentication, or if you need to use POP before SMTP. If you are using POP before SMTP, you can run into sporadic issues with mobile devices.
https://serversmtp.com/smtp-error/
“User not local or invalid address – Relay denied”. Meaning, if both your address and the recipient’s are not locally hosted by the server, a relay can be interrupted. It’s a (not very clever) strategy to prevent spamming. You should contact your ISP and ask them to allow you as a certified sender.
https://workaround.org/ispmail/jessie/relaying-smtp-authentication
Your mail server is not responsible for the “example.com” domain so it receives John’s email and forwards (relays) it to the mail server that is responsible for …@example.com email addresses. This may seem like a harmless scenario but your mail server must deny that:
https://social.technet.microsoft.com/Forums/exchange/en-US/1c721f0d-25f1-4228-a363-3f524830f380/how-to-open-smtp-for-authenticated-relay
Jan 11, 2018 · But how do you turn on Authenticated SMTP Relay in Exchange 2013 if the clients are not coming from a fixed IP address or range. Specifically, think about someone on the Internet who wants to connect to the Exchange server and relay mail through it, but authenticated.
https://community.spiceworks.com/topic/334964-smtp-server-relay-for-office-365
Oct 24, 2013 · But if you're only sending mail to Google Apps users (and using a Google SMTP server), you shouldn't need to worry about authentication. That should only come into play if you want to send mail to a user outside of the Google/Gmail domain (e.g. [email protected], etc.).
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