In the following, you will find an explanation for the most important error messages displayed by the mail.com mail system in case of delivery issues.
Too many messages have been received in a short period of time. Please try again in a few hours and reduce the sending rate. If this does not help, you or your administrator can contact us here.
No “IP warming” is required when sending newsletters with trustedDialog.
For administrative reasons, email delivery is temporarily not permitted. Please follow our email policy in order to ensure a trouble-free email communication.
Your e-mail was temporarily rejected due to a general system overload.
The email was rejected, because it was sent from a server that is not included in the domain owner's SPF record. This usually indicates that the sender address has been spoofed and that the email is spam/phishing.
Information for administrators: Should you offer an email forwarding service without rewriting the MAIL FROM, we would strongly advise you to implement SRS (Sender Rewriting Scheme), to avoid unwanted rejections.
Information for users: Should your forwarded emails not be delivered to your inbox, we would advise you to replace the mail forwarding with the Mail Collector service available in your account. This service will automatically retrieve emails from other mailboxes:
https://support.mail.com/email/settings/mailcollector.html
Should you have signed up to newsletters, we would advise you to use the email address you have with us for your subscriptions. This will avoid getting your subscriptions accidentally cancelled by the sender due to a failed email forwarding.
The trustedDialog email seal and brand logo of the sending company in the inbox indicates that the newsletter comes from a trustworthy sender.
Due to an incorrect configuration, email reception has been refused. Please contact your administrator who should correct the server configuration based on our recommendations. Please contact your administrator who should correct the server configuration based on our recommendations and apply to us for the systems to be unblocked.
Emails from your email server were rejected because the PTR Resource Record (PTR-RR) of your IP address does not follow our guidelines. Possible reasons for this can be:
Your message will be rejected by our system if: any of the technical information included in the email doesn't meet the RFC 5321 and RFC 5322 standards, the email violates our guidelines or, it is not plausible, i.e.: when specifying the date. This is applicable to all emails with more than one of the following headers: BCC, CC, Date, From, Sender, Subject, To. In addition, the headers "Date, From, Sender, To" must be syntactically correct.
The email has been rejected due to our current security policy. This may occur if the sender domain is known as a spam domain. To check if a domain is listed, you may use a lookup tool such as the following: Spamhaus. If you are still experiencing problems, please request your system administrator to contact us.
The e-mail has been rejected because it violated our security policy: If a high percentage of e-mails are classified as spam by our filters, all messages coming from the sender's IP address will be temporarily rejected for a specific time frame.
In case the issue still persists, even if you cleaned up your system, you can contact us here.
We were unable to deliver your email because the potential recipient does not have sufficient free space in their inbox. Please use a different method to contact the person in question and inform them of the situation.
To reduce spam email reception, we use popular DNSBL-lists (DNS based Blackhole List). These lists contain dynamic IP addresses and IP addresses currently known to be spam senders. Please contact your system administrator and/or email provider who should check if the IP address they use is on one of these RBL (Realtime Blackhole List) and who should then take the necessary steps to have the IP removed. In addition to this, we manage our own Black lists based on various criteria. If required, you or your administrator can contact us.
Thanks to the thorough sender authentication process, sending emails with trustedDialog reduces the probability of a legitimate sender being placed on an internal blocklist.
For administrative reasons delivery of emails to our systems is not permitted. Please contact the administrator of your system who should then contact us.
The IP address of the email server you are using is not assigned to a domain name in the domain name service (DNS). Please contact your administrator to have the domain name added to the domain name service.
The sender domain of the email server you are using has not been configured in agreement with the RFC guidelines in the domain name service (DNS). The following reasons may be responsible for this:
Please contact your administrator to correct the entry in the domain name service. A configuration check can be conducted under intodns.com.