Spam is a multi-level and can be a tricky issue to deal with. Most of the problems can be rectified with the end-user taking appropriate action, some require collaboration with the recipient IT department.

If your email is going to spam at the other end with a recipient, then we will need that person to provide us with some information so we can look at why it is happening. Usually, this is an issue with Spam rules/filters on their end, and we have limited ability to fix it.

1) Please provide the following instructions to the recipient and ask them to send us the Message Headers  for an affected email: https://support.google.com/mail/answer/22454?hl=en

2) You can provide us with the Message Headers for the email you sent, by finding it in your sent items. How to supply us with the original message headers.

From there we can advise what action needs to be taken, noting that it may be out of our (and your) hands as it's an issue at the recipient's end.

3) Can you identify a pattern? i.e. are they from the same sender, or domain? Any time of day?

4) Does the issue appear simultaneously by sending email via mobile app and/or gmail.com? Does there seem to be any inconsistency between the synchronisation of the clients?

5) Are you using a third party client e.g. Outlook / Mac Mail? If so, try via gmail.com to see if that makes a difference. 

6) Try removing your signature and sending an email with almost no content - sometimes attachments and email signatures trigger spam rules that prevent your email getting through. 

7) You can also get your Google Workspace admins to gather some information from your side if you know the specific email recipient. Conducting a search in the Email Audit Log will provide more detailed information for us to review. NOTE we cannot perform this for you as it would break the privacy restrictions on your email data.