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Sometimes mail servers reject e-mails from our servers because of some spam server rules. Name service error for name=example.f type=A: Host not found If you think that it might have to do with our mail servers, please contact us for help! Hints: You can try to contact the person another way, e.g. In this case, there might be a typo in the part after the at sign or the server is offline or has not been configured correctly.

The mail server does not exist or is (temporarily) unavailable or does not accept e-mails for some other reason.Mailbox limit exceeded while appending messageĥ52 Requested mail action aborted: exceeded storage allocation Oftentimes it can be a good idea to follow up some days later again, as another person or colleague with the same problem might have contacted the recipient in the meantime as well. The recipient will have to make space in his/her mail account by deleting messages from the mailbox. Hints: You can try to send the person a very short e-mail to inform about the problem or call him/her etc. This used to be a very common problem, but does not happen very often anymore today, as most providers offer enough storage to their users. The mail box of the recipient is full.: host. said:ĥ50 Invalid recipient (#5.1.1) (in reply to RCPT TO command)

u48si4736933wrc.243 – gsmtp (in reply to RCPT TO command) Please try 550-5.1.1ĭouble-checking the recipient's email address for typos or 550-5.1.1 : host aspmx.l. said: 550-5.1.1 TheĮmail account that you tried to reach does not exist. Requested action not taken: mailbox unavailable (in reply to RCPT TO command) (ID:440:1:2 ()) (in reply to RCPT TO command) Recipient table (in reply to RCPT TO command) : Recipient address rejected: User unknown in relay In a lot of cases, search engines will find the correct address. If you think there is only a small typo in the address, you can also try to search the person and the e-mail address on the web. If the wrong address was entered for an co-author, you can simply contact the submitting author and ask him/her to update the e-mail address. Hints: Misspelled e-mail addresses can be found quite frequently in ConfTool for the addresses of co-authors, but they are rather rare for the addresses of users, participants or submitting authors. Usually the error message lists the error code 550.

The mail address is wrong, the part before the at sign does not exist / is unknown.

We also provide several typical error messages, but unfortunately, the exact error message differs from mail system to mail system.

You can find the most frequent reasons for errors below and some hints on what you can do to solve the problem. There are several reasons for undelivered mails.

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