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About DKIM - G Suite Admin Help -
Help prevent email spoofing on outgoing messagesUse the DomainKeys Identified Mail (DKIM) standard to help prevent email spoofing on outgoing messages.
Email spoofing is when email&nbs
dkim  google  gmail  email 
16 days ago by insertrealname
How to stop spam email being sent from your domain
Will this stop my domain being used by spammers?

As noted previously there is no means that we can stop others from maliciously using our domain as the sending domain. Using the instructions above we can instruct receiving email servers that we haven’t authorised any servers except those where we’ve added SPF and DKIM records, to send our email messages. This means that the majority of spoof email messages will be sent directly to the recipients spam/junk folder whilst not damaging your domain quality.
mailserver  dns  spam  spf  dmarc  dkim 
29 days ago by dusko
Can I prevent spammers from spoofing legitimate users in my domain on the Email Security Gateway? | Barracuda Campus
There is no way to stop a spammer from using any one email address for the spam they send out. There are however things that you can do to help prevent this from becoming a huge problem. These would be setting up SPF, DKIM and/or DMARC services for your domain. This will let people who receive email from your domain block sending IP addresses or senders who are not authorized to send mail for your domain. Although these can be used in conjunction with the SPF settings on the appliance to provide sender spoof protection, there are additional settings on the device, designed to address this specifically.
mailserver  sendmail  spam  spf  dkim  dmarc 
4 weeks ago by dusko
OpenDKIM is a community effort to develop and maintain a C library for producing DKIM-aware applications and an open source milter for providing DKIM service.

The project started from a code fork of version 2.8.3 of the open source dkim-milter ( package developed and maintained by Sendmail, Inc. (

OpenDKIM is an open source implementation of the DKIM (Domain Keys Identified Mail) sender authentication system proposed by the E-mail Signing Technology Group (ESTG), now standardized by the IETF (RFC6376) ( It also includes implementations of the RFC5617) ( Vouch By Reference (VBR, RFC5518) ( proposed standard and the experimental Authorized Third Party Signatures protocol (ATPS, RFC6541) (

The OpenDKIM package consists of a library that implements the DKIM service and a milter-based filter application that can plug in to any milter-aware MTA to provide that service to sufficiently recent sendmail MTAs and other MTAs that support the milter protocol.
dkim  mailserver  smtp  mta  spam  sendmail 
6 weeks ago by dusko
Trusted Domain Project
The flagship project, OpenDKIM (, is a set of tools for associating validated identifiers with Internet mail. It is in use by major Internet service providers such as Yahoo! and AOL. This project also permits collection of data about messaging usage patterns, to identify possible new filtering techniques. Visit the Initiatives link at left for information about other active or pending projects.
mailserver  sendmail  spam  dkim 
6 weeks ago by dusko

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