Mail — diagnostics and troubleshooting

Contents

• 451 domain.ru prohibited. Disk quota exceeded
• 452 message sending quota exceeded, try later
• 476 connections from your host are denied
• 550 Your message was identified as SPAM
• 550 mailbox@domain.ru prohibited. We do not relay
• 591 mailbox@domain.ru You must authenticate first

451 domain.ru prohibited. Disk quota exceeded

It means that the disk space allocated for the domain has been exhausted.

Recommendations to sender:

Dispatch should be repeated in some time. Generally, mail server undertakes repeated attempt automatically.

Recommendations to recipient:

To resume mail receipt you may:

• re-distribute disk space in section "Quotas" — "Quotas management" of the hosting control panel (https://www.r01.ru, "Account manager" section).
• delete unwanted messages from the mailboxes,
• select price plan with a larger disk space (with further quotas reconfiguration).

Quota of a specific mailbox may be increased by going to control panel "Mail server" — "your_domain" — "Mailboxes". If "Inbox" folder reached its 2 GB limit, create a new folder and move to it a part of old letters through web interface http://mail.r01.ru.

452 message sending quota exceeded, try later

It means that the mailbox reached its limit for sending messages (50 letters per 15 minutes). The ability of sending letters will be resumed automatically within 10 minutes.

• Mail system limitations and specifics

476 connections from your host are denied

It means that the connection from your IP address to hosting mail server is temporarily blocked. It occurs as a result of multiple errors during operation with mail server:

• multiple authorization attempts with wrong login and password,
• sending letters to non-existing addresses,
• multiple attempts of letters dispatch at reaching limits specified on the page "Mail system limitations and specifics".

Blocking is lifted automatically within 15 minutes. To fix the problem we recommend checking correctness of mail clients settings. If the problem persists, notify technical support about it to support@r01.ru and specify in a letter:

• your agreement number,
• mailbox, where there is a problem sending letters,
• your external IP address. It is available on websites http://myip.ru and http://2ip.ru.

550 Your message was identified as SPAM

It means that incoming letter was identified as spam based on its contents analysis.

Recommendations to sender:

Try to change letter heading and try again. If the problem persists, please, contact the recipient by other means of communication with a request to add your domain to white list.

If you have no contact data of the recipient's registrant, use Whois service.

Recommendations to recipient:

You may add sender's domain to white list, then the mail from this domain will not pass spam filter. To add domain example.net to white list, it will be required to:

• Log in to control panel (https://www.r01.ru, section "Account manager"), using your agreement number and password;
• go to "Mail server" section;
• click on email domain name;;
• go to section "Spam filter" — "White list";
• add mask *@example.net in block "Email address new mask" and click on "Create".

550 mailbox@domain.ru prohibited. We do not relay

It means that address mailbox@domain.ru does not exist in R01 hosting mail system. Check spelling of address and try again.

591 mailbox@domain.ru You must authenticate first

It means that authorization is not set in mail client on the outbound message server (SMTP) mail.r01.ru by box name and password (similar to inbox mail server).

We recommend checking correctness of mail client settings. For example, if you use Outlook, make sure that in account settings for the outbound server there is a check just opposite "SMTP server requires authentication" and "Similar to inbox mail server" settings.

• Mail clients setup