开云体育

Chris,

I /can/ see the rationale behind this. However, I find myself
wondering about "training spam filters"; precisely what does it mean?

Most content-based spam filters have a provision for users to make corrections - marking as "not Spam" messages which should not have been delivered to the Spam folder, and marking as "Spam" those which were delivered to the Inbox but should have been in the Spam folder.

The "should" in the above is deliberately subjective. Ideally, the filter takes the user's corrections into account to better tune the results to each user's preferences. Some email services' filters are better at this than others.

My ISP is BT (I'm in the UK) although I normally use Outlook as my
email client. When we first migrated to Groups.io I found that quite a
few messages from Groups.io were being diverted by BT (or whoever!)
having marked them as spam, so unless I went looking for them they
were invisible.

This is a common problem when using an email client via the POP protocol: the client sees only the server's Inbox, messages diverted to other folders (such as Spam) at the server are invisible to the client. Using the IMAP protocol instead has several benefits, not the least of which is making the rest of your server folders accessible through the client.

invisible. My immediate workaround was to switch all spam filtering
off - obviously not without risk but at the moment the result is
manageable.

When I was using POP I would generally turn off the email service's spam filter as well, or tell it to mark the messages but deliver them to the Inbox anyway. Then my POP client (Eudora Pro) had its own spam filter - which I generally found to be better than my ISP's filters.

However, I also have a Yahoo mail account only because it was
unavoidable as a Yahoo Group member (several of them) & moderator (of
one). Try as I might I cannot find a corresponding means of defining
safe senders; /yes/ I can mark individual emails as "not spam" but how
many times would I have to do that for Yahoo to "learn" that
@groups.io messages were safe? Would it /ever/ actually learn that?

I have several as well, but I don't access them except for testing things. So I really can't tell you anything about the nature or quality of Yahoo Mail's filter.

I believe though that you can set up a filter in Yahoo Mail that will match any message with "groups.io" in the To/CC field and have the action be to send it to the Inbox. But you'd have to try it to see if it bypasses the Spam designation.

Is Yahoo the exception, with ALL other mail providers allowing
specified senders to be marked as being safe?

I'm not sure, it may be the other way around. Most of the time I've read instructions for particular email services it seems like the advice is to either add the address to your address book, or to add a filter rule. The trend may be away from separate white/black lists.

With such a proliferation of Mail Providers it is almost certainly too
simple to expect there to be a "one size fits all" instruction to
members.

That is certainly true.

Shal
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