No change in behavior after applying the change. That ‘sph_subscriptions_email_replyto’ string is mysterious to me anyway, as referenced above. No other code references that filter tag, except for the sp_subscriptions_do_post_notifications() function and the code just added. And there is no function by that name.
So Reply-To here is still empty, which leaves only the sfmail options account as the From and therefore no forum-specific addresses.
It looks to me like sp-subscriptions-components.php/function sp_subscriptions_do_post_notifications() wants a real ReplyTo where it says:
# send the notification
$replyto = apply_filters(‘sph_subscriptions_email_replyto’, ”);
And so PBE should register a filter function on ‘sph_subscriptions_email_replyto’ to give it a forum-specific reply-to value. And maybe the same logic would apply for From values (not sure if filter ordering would make this tricky).
I see where you would not want to do the hack that I did to always give a forum-specific reply-to inside of the subscriptions code–this is exactly why you would want PBE to register its own filter, I think. (I have not actually gotten to filters yet in my PHP/WordPress learning, but that’s my suspicion).
Thanks!