PSMail’s security includes the digital signing of each individual email (DMARC) and its Domain Name System (DNS). Though the security benefits are substantial, this feature can make it difficult for other service providers (MailChimp or Constant Contact, for example) to appropriately relay email as if the email came from a PSMail authenticated user. When using one of these third-party services, a PSMail user may have trouble getting their messages to go through and be authenticated by the recipients.
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