I sent the email but it seems like it didn't arrive so I will resend it.
『先日招待状[メール](https://eikaiwa.dmm.com/uknow/questions/32887/)を送信しましたが、数名に届いていないようなので、再度[送信](https://eikaiwa.dmm.com/uknow/questions/55439/)します。重複したらすいません。こちらに返信をお願いします』 = I sent the invitation email the other day but it seems like several people didn't receive it so I'm resending it. I apologize if I'm sending a duplicate. Please reply to this email.
になります。
＜ボキャブラリー＞
send = 送る
sent = 送った
invitation email = 招待状メール
receive = 受け取る
resend = 再送する
apologize = 謝る
reply = 返信する
I sent you an email, but it seems like it didn't arrive, so I'm sending it again.
I sent you an email, but it seems like you didn't get it, so I'm sending it again.
「メールを送信しました」は英語で"Sent an email"となります。
再度[送信](https://eikaiwa.dmm.com/uknow/questions/55439/)は"resend" or 直訳で"send again". どっちらでも使われています。
〜のようはこの状況で"~seems like"となります。
[届く](https://eikaiwa.dmm.com/uknow/questions/55778/)は"arrive"で。
全部を纏めったら「文脈も含む:
Sorry, this might be a duplicate email, but I sent you an email, but it seems like it didn't arrive so I'm sending it again.
アメリカ合衆国 
日本 
