mail is from a mailing list

Hi wenzani,

Welcome to Apple Support Communities. It may be best to first start with determining whether this happens for multiple email accounts or a specific account. The issue might be related to an email account. If so, check the webmail account as well. That will let you know whether the emails are not loading only on your Mac or everywhere.

Next, try the guidance in If you can’t receive emails in Mail on Mac. Although you do get the email it seems, this article can help since you do not get all of the content of the message. For your convenience, guidance is as follows.

• Check whether Mail is retrieving a large message or a message with large attachments. See View Mail activity.

• Check if you’re using filters in the message list that are preventing expected messages from being shown.

• Try sorting messages in the message list by Date or another attribute, or searching for messages, to verify if you received them.

• Check whether your account is offline or disabled (inactive).

• If you’re missing emails from a specific person or group, check whether you blocked messages from them.

• Try quitting Mail, then opening it again.

• Choose Window > Connection Doctor, then follow any instructions in the Details column. Check for problems logging in to email accounts or with the incoming Mail server, or with firewall software blocking network traffic.

Check whether you’re affected by another firewall, such as software installed separately from macOS or built into an internet sharing router, or administered by your email account provider. Contact the appropriate person for information.

• If you’re still having problems, contact your email account provider to verify your user name, password, incoming mail server, and other required information. Then verify the information is entered correctly in Mail account settings.

Kind regards.