Please let me know ...

[firewallengineer]

Normally, at the end of email writing, we’ll ask the recipient if they have any questions or concerns. I notice people tend to use the following sentences. Based on my limited knowledge in English, I don’t think there are any errors, but could you please verify it and suggest is there any better idea to close the email with something similar?

1. If you have any questions regarding this meeting, please call me at xxx-xxxx.
2. Let me know if you have any questions or concerns.
3. Let me know if you have further questions/any issue encountered
4. Let me know if you need any help.
5. Please let me know if I can provide any further information or if you have any questions.
6. Please let me know if there are any questions or suggestions.
7. Please let me know if you have any questions, or if any issues arise regarding the devices
8. Please let me know if you need more information.
9. Please let us know if you have any concerns, e.g. on the activity date / time and your alternative proposal.
10. Should you have any further questions please do not hesitate to contact us

 

[billmcd]

All OK except in #3 "any issue encountered" is not formatted correctly. "Encountered any issue" would be better but I don't think it's commonly used.