I currently offer email subscriptions on my blog, something I coded myself in PH

Question

I currently offer email subscriptions on my blog, something I coded myself in PHP.

People sign up on the blog using their email address. I send them an email with a link to verify their email address and once verified, they get an email whenever a new post is published. I only publish about 4 or 5 posts in a month and every email sent has an unsubscribe link which unsubscribes them right away if they wish. I hate spam so I definitely don't want to send anyone email that they don't want. I'm constantly checking to see if any of the emails bounce (nothing does) and would remove them from the list right away if there was ever a problem. I'm presently not having any problem with the emails being delivered and as far as I know, they're not ending up in people's spam/junk folders. I've set up my VPS box with SPF and DKIM, SSL only, etc

Explanation / Answer

Signing emails is useful only insofar as recipients verify the signature. Theoretically, signing the emails might improve deliverability, but only if a recipient configures his filters for incoming emails to verify email signatures and accept emails which have been verified to come from you. However, this is only theoretical; in practice, email filtering is not under control of the end user, but done in the email server, and no server verifies S/MIME signatures. In fact, there are some (poorly configured) antispam system who will react negatively to signature (because they don't understand them), so signing emails is probably a bad idea in your case.

Said otherwise: if signing emails improved deliverability, then spammers would do it.

Another general comment is that you should not want to sign. When you sign something, you are actually building a legal weapon aimed against you: a signature can only serve one purpose, which is to rub your data in your own face. If you think clearly about signatures, then you should actively avoid signing anything; what you want is that other people sign what they send to you.

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