In addition, notice that even GMail doesn't actually filter spam. It just hides it - it's an assistant, not arbiter of what you should see. It's more than happy for you to adjust the filters (for yourself personally).
Edit: GMail also does prioritization as of recently - but again, the purpose of that is to help users not filter content. Again, those algorithms are also adjustable for each user separately, they just have some "smart" defaults.
- Reject delivery of mail from sources it has determined to be spammy (e.g. residential IPs) - this mechanism allows the sender to be aware that delivery failed.
- Accept delivery and then silently drop the message somewhere between after accepting delivery but before appearing in the end user's mailbox.
In either case, there is nothing you (the mailbox holder) can do. In the second case, there is no way for anyone to know the message hasn't been delivered.
This is not accurate. There is a long on-going issue with GMail (and others) wholesale blocking delivery of email from domains/IPs/providers it deems to be spam or otherwise inappropriate. GMail users get no indication/notification, and generally have no idea that email sent to them was simply not delivered.
Conservative outlets work similarly, but they seem to have bigger online operations and are hard to get out of. My in laws get barraged with this stuff, and a mail provider like GMail or Microsoft gets a lot of spam signals from it I’m sure.
If you explicitly solicit those emails, eg by signing up to a newsletter, it's not spam.
On the other hand I get unsolicited email from some Democrat groups, and I never see such emails in spam.
You can freely view the emails in your spam folder, with one click. You can optionally move the emails to your inbox and train Gmail ("not spam" button) not to place them there in the future.
It's going too far to call it censorship (in any manner) when an email provider places an email into a spam folder that requires one click to view/review.
If those emails are flagged because they’re “conservative” then I agree with you that needs to he corrected.
However, if those emails are flagged because they violate well known spam rules then let’s help “conservative” email senders to follow the rules. Examples include not using single or double opt-in for signup, not honoring or providing an opt-out link, using emails from a bulk list that includes known flagged emails, not including a plain text copy of the email in the message, and originating from a flagged server. Reputable email services like MailChimp go to great lengths to educate email list admins how to follow these rules & curate high value email lists.
One year, I made a concerted effort to troll some friends by getting them bumper stickers from the opposing party that they supported (e.g. dems got republican bumper stickers, repubs got democrat bumper stickers).
Since then, despite being sure to opt out of mails at the time of purchase, and clicking 'unsubscribe' numerous times, both parties continue to spam me.
Gmail filters these emails into spam for me. Thank goodness.
I'm led to believe that if enough gmail users mark emails as spam, this will get fed across to other users that haven't. So you can probably blame people like me for marking these messages as spam, for it occurring to you.
Or y'know, they could actually honor the 'unsubscribe' request and stop spamming me, and I wouldn't have to mark it (legitimately) as spam.