We have the pleasure of informing you that...

We are pleased (glad) to inform you that...

Further to our letter of yesterday, we now have (the) pleasure in informing you that...

We confirm telegrams/fax messages recently exchanged between us and are pleased to say that...

We learn from... that you are interested and well experienced in... and would like to establish business relationship with us.

Although no communication has been exchanged between us for a long time, we trust that you are doing well in business.

Although we have not heard from you for quite some time, we hope your business is progressing satisfactorily.

We have pleasure in sending you our catalog, which gives full information about our various products.

We are pleased to send you by parcel post a package containing...

We have the pleasure in acknowledging the receipt of your letter dated...
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