Catch-all explained: one address for everything
What does "catch-all" mean? And how does NeoMail24 receive e-mails sent to almost any address on its domain? A look behind the scenes.
DKIM (DomainKeys Identified Mail) is a digital seal for e-mail. The sending mail server attaches a cryptographic signature to every outgoing message. That signature is calculated from the content of the mail - subject, body and important headers.
The receiving server reads the signature and fetches the matching public key from the sender’s domain via a DNS query. If the signature matches the content, one thing is proven: the mail really comes from a server of that domain and was not modified on the way. A single changed line makes the check fail.
In NeoMail24 you see the result as a traffic light on every mail: green ("verified") means SPF, DKIM or DMARC confirm the sender. Yellow ("unclear") means the sender’s server delivers no complete verification results. Red ("warning") reports forgery signals - do not enter any credentials and do not pay anything.
Good to know: DKIM only proves that a mail arrived unmodified from the stated domain - not that the sender is reputable. Criminals sign their mails too. The traffic light is your reliable first impression, but common sense remains the best protection.
DKIM is one of the three pillars of e-mail authenticity. Read how the other two - SPF and DMARC - work together in the next guide article.
What does "catch-all" mean? And how does NeoMail24 receive e-mails sent to almost any address on its domain? A look behind the scenes.
SPF defines which servers may send for a domain, DMARC decides what happens to forgeries. How the two work together.
In the FAQ you will find everything important at a glance: costs, storage, spam protection and the referral program: FAQ