Final request of cenomar or AOM

[mgcedeno]

Hi... So the immigration emailed me that they needed my cenomar or AOM. I already sent it to them using my Gmail account because they said for fastest service i can just scan and email it to them and they gave me a specific email address for the requested document. Im worried about my composition of email. What i did, i put "Cenomar or Advisory on Marriages" as the subject and on the message itself i typed my UCI and Application number and then i attached my cenomar. I sent it multiple times. I'm worried if they didn't receive it. Should i be expecting a response from them that they got it already? Should i send it through post office to make sure or what? I have only until march 7. They only gave me a month