Bcc contents sometimes missing on iPhone sent mail.

Hello KRDHarris,

Thank you for using Apple Support Communities. Sounds like you're missing some Bcc recipients from showing when reviewing your emails. You did mention that this issue was occurring with your iPhone. To confirm, does this issue occur with other devices or is this specific to your iPhone only? If this is specific to your iPhone, we can recommend some steps to help further isolate this issue and see if we can get this issue sorted out. You're already fully updated, so let's try the basic steps below:

1.) Refresh things by closing out the Mail app.

2.) Restart your iPhone.

If that doesn't help, try removing the affected email account and then re-add it back to further test and see if bcc recipients populate correctly.

Remove affected email account.

1. On your computer, sign in to your email provider’s website. Make sure that all of your email is there or make sure that your email is saved somewhere other than on your iOS or iPadOS device.

2. On your device, go to Settings > Mail, then tap Accounts.

3. Tap the email account that you want to remove.

4. Tap Delete Account.

Re-add email account: Add an email account to your iPhone, iPad, or iPod touch - Apple Support

Remember to save any pending emails you might have prior to attempting this specific step. Feel free to keep us posted on your results. Thank you for using Apple Support Communities. Cheers.

When you go to your provider's webmail, do you see the content?