以下はいくつかの例です。
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Pursuant to our conversation …新
When we talked yesterday …
When we spoke yesterday …
When we spoke on the phone yesterday …
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We are in receipt of …新
We have received …
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Attached herewith …新
We have attached …
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Enclosed please find …新
We have enclosed …
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Per your request …新
As you asked …
As you wanted …
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Please be advised that …新
削除してしまう
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Please rest assured …新
削除してしまう
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If you should have any questions, please do not hesitate to contact me.新
If you have questions, please call me at …
参考：”The Accountant’s Guide to Professional Communication” by Melanie McKay and Elizabeth Rosa