Receiving emails

Thanks for trying to help. All useful articles but none of them relate to my specific situation:

• some emails get through, others don’t.
• some senders seem to be blocked, normally new people (e.g. my architect and my garden designer) even when they press reply
• happens on all devices
• emails not visible in iCloud mail either, so emails are disappearing into the ether
• senders are not notified

Thank you, tygb. I'm not sure any of these generic articles addresses the very specific problem I have outlined above. As a Mac user of 30+ years I'm familiar with setting up email accounts and sending and receiving emails on different devices. This is a problem across all devices and for only some emails. Obviously, I don't always know what emails I haven't received, only when someone makes an effort to contact me a different way to ask why I haven't replied. Also, emails forwarded from my Wordpress.com account don't arrive to my Mac inbox but do arrive vie Googlemail which is another way I can tell that some emails are not getting through while others are. I have already looked into this extensively, it's not a simple fix. Someone suggested that I may be blacklisted by some servers but I don't know why or how that would work. Very confused. Thank you.

Wordpress.com is where I run my business. Yes it is necessary. I don't use it to sign in. I have a contact form on my website that is coded to send messages to me at my @Mac.com address. It doesn't work. The messages don't arrive. It is just one of the ways that my Mac.com email doesn't work, not the root of the problem. I'm grateful for your willingness to help tygb but please don't keep sending replies that are not relevant for my problem. Thank you.