Lost emails

Question

Dear Sirs,

I did not reveice any emails 27/04 and 28/04 for two days.

I realized that my mailbox was full and I deleted most on 29/04, still emails I should have received for these 2 days did not appear.

I am waiting very important email and I need to be sure if I received this email on either 27/04 or 28/04.

Please advise me how I can get back my emails.

Looking forward to your quick reply,

Thanks in advance.

Regards,
Doga Tatlidil