FAQ for system administrators
Why is their a delay in delivering my emails?
Because email is an asynchronous medium, we and all other providers cannot guarantee prompt delivery. However, we do have a large team of specialists who work on ensuring trouble-free email correspondence.
Why are my emails being identified as spam?
The 1&1 spam filter systems comprise a number of different IP-based and content-based filter modules. This means that an email can be incorrectly identified as spam. Please send us the extended header for any email of this kind.
How can I ensure that my emails are not identified as spam?
Please observe our recommendations on sending emails.
My systems have just recovered from a malfunction. Why are my emails still being rejected?
When our systems detect that spam is being sent from specific servers, IP-based blocking of the compromised system becomes effective. Please use this contact form so that we can manually unblock your systems.
How can get on the 1&1 whitelist?
1&1 does not offer this service. Please observe our recommendations on sending emails. If you observe these recommendations, whitelisting is unnecessary.
Does 1&1 use greylisting?
In case of unmistakable characteristics that indicate a spamming server, we delay any emails sent from a specific IP address, or reject them completely. Please observe our recommendations on sending emails in this respect. If you observe these references, we can rule out delayed acceptance of your emails.
Why are connections between my server and the 1&1 systems being refused?
Please check if your email server's IP address is listed on an established RBL list. You can check this here. Please contact the list operator directly in this case.
Additionally, check your server logfiles as of the first occurrence of any error.
Check whether you comply with the standards defined by the RFCs. This includes providing a syntactically correct sending address, the use of HELOs that return the IP address in a reverse lookup, and setting up a Reverse DNS entry (FQDN) for your email server's IP address.
Your systems may have been misused to send emails by unauthorised persons. Harden your systems against unauthorised use.
If you send newsletters or mass mails, check your delivery quota and remove any email addresses that no longer exist from your database. You must have the explicit permission of any recipients to who you send emails.
Please contact us to discuss the situation and/or unblock your server. Please send us relevant logfile entries and a description of the error that occurred including the error messages. Please use our contact form for this purpose.
My question wasn't listed. How can I contact 1&1?
If you have any further questions about sending emails to 1&1, please use the contact form to contact us.
