Mail - Don't receive emails from certain senders

Apple's junk filter will make some messages disappear. They don't go to the Junk folder. You just never receive them. While it's great for child **** it can catch messages that are legitimate. There is no setting to train these messages as good. Doubtful even contacting Apple would help.

As you have found, using another email address is the solution.

It is that I am not receiving messages I want to receive from companies where I have signed up for their services

Sometimes the problem is either your ISP who - for whatever reason - has flagged the email address from the sender and does not forward it - or possibly that the sender's server has a problem with your email address - Apple's server could be stopping those emails. Nowadays email providers and ISPs do a lot of scanning of addresses and rejecting some for one reason or another. So, I'd suggest you contact the service and ask them to send you a test email - preferably to two different email addresses for testing purposes.

Read the article : Identify and report phishing emails and other suspicious messages - Apple Support

How to identify a phishing attempt

Scammers often use messages and notifications that are designed to look like they’re from a legitimate company or a person that you know to try to trick you into sharing your password, credit card, or other personal information with them. Phishing scams can come as an email, text, or even a phone call or web page.

These are common signs of a possible phishing attempt:

• The sender’s email address doesn’t match the name of the company that it claims to be from.
• The message was sent to an email address or phone number that's different from the one that you gave that company.
• A link appears to be legitimate but takes you to a website whose URL doesn’t match the address of the company’s website.
• The message starts with a generic greeting, like “Dear valued customer” — most legitimate companies will include your name in their messages to you.
• The message looks significantly different from other messages that you’ve received from the company.
• The message requests personal information, like a credit card number or account password.
• The message is unsolicited and contains an attachment.
• The phone call is unsolicited and the caller claims to be an Apple employee or support representative. Callers might use flattery, threats, or name-dropping to pressure you to give them information or money.

Follow the steps in the article .

As per the article : Mail for Mac: General preferences in Mail

Use General preferences in Mail to set options for checking for new messages, downloading attachments, searching, and more.

To view these preferences, choose Mail > Preferences, then click General.

spam/fishing is not stopped, junk goes to the junk folder.

For spam/junk coming in constantly:

Quit Safari, then start Safari while holding the Shift key, then in the Safari Preferences select "Clear History..." and clear all history and website data. After that check that your Home folder is still set to what you want.

Now it should be gone mostly, but it depends largely on the the s**t websites that you visit.