Hello!
You've got a perplexing issue on your hands. It's good that you've identified some patterns and behaviors, which will aid in troubleshooting. Here are several steps and considerations based on your description and the distinction between your Mac and iPhone behaviors:
1. **Check Email Client Settings**:
- First and foremost, scrutinize the settings of your email client on your Mac. Ensure that account B's outgoing server (SMTP) settings are correctly configured. It might be possible that account B is somehow configured to use the SMTP server of account A.
2. **Update Email Client**:
- If any updates are available for your email client, install them. Sometimes, bugs are fixed in newer versions of software.
3. **Re-add Account B**:
- It might help remove account B from your email client and add it back. This could clear any incorrect configurations.
4. **Check Default Account Settings**:
- Some email clients have a setting for a default account that is used for sending emails. Ensure that this setting is not causing the issue.
5. **Examine Email Alias Settings**:
- If your email client supports aliasing, ensure that no aliases that might be causing this issue are set up incorrectly.
6. **Examine Draft Folder Settings**:
- Some email clients allow you to specify where drafts are saved. Ensure that this setting is correct for account B.
7. **Use a Different Email Client**:
- As a test, try a different email client on your Mac and see if the problem persists. This could help identify if the issue is with the email client or some other configuration on your Mac.
8. **Check for System-Wide Profiles**:
- On your Mac, check if any system-wide profiles are installed that might be affecting email settings. You can find these in System Preferences under Profiles.
9. **Contact Support**:
- If all else fails, it might be a good idea to contact the support team of your email client or your email service providers for further assistance.
10. **Consult Forums**:
- Sometimes, user forums for your particular email client or Mac may have others who've faced similar issues and have found solutions.
The discrepancy between your Mac and iPhone behavior suggests that something specific to the configurations or the email client on your Mac is causing this issue. It's encouraging that the behavior is correct on your iPhone, which suggests that with the proper settings or troubleshooting steps, your Mac can be corrected as well.
Each of these steps aims to isolate and identify the issue's root cause. It's a meticulous process but necessary for resolving perplexing problems.