to act on behalf of
to agree with
 always at your service
 as agreed
 as far as I'm concerned
 as far as the payment is concerned
 as follows
 as per invoice
 as per to the conditions
 as per your request
 as requested
 as soon as possible
 at your convenience
 at your earliest convenience
 at your expense
 awaiting your reply
to be able to
to be authorised to
to be characterised by
to be confident in
to be delighted to
to be held responsible for
to be in arrears with payments
to be in difficulty
to be interested in
to be late
to be overrun with orders
to be prepared to - to be willing to
 before the date we agreed upon
 Best regards
 body of the letter
 circular letter
 claim - letter of complaint
to come to a decision
to come to an agreement - to reach an agreement
 complimentary close
to cope with the competition
to correspond to the sample
to correspond with
 covering letter
 due to oversight
 enclosure - attachment
to fix an appointment
 following your instructions
 from order receipt
 further to our letter - following our letter
 goods listed below
 greeting
 half-price
to have the pleasure to
to have the power to
 hereby
 in case of need
 in compliance with - accordingly
 in due time - in due course
 in good condition
 in our favour
 in partial payment
 in reply to your letter
 in the absence of
to inform in due time
 inside address
to let someone know in advance
 letter opening - beginning of the letter
 letterheading - heading
to look forward to
 looking forward to an early reply
 looking forward to hearing from you
to make the goods available
to meet a demand
to meet customer's requirements
to meet the demand
 Messrs
to notify in advance about
 on advanced payment
 on arrival of the goods
 on behalf of
 on condition that - provided that
 on delivery
 on receipt of the order
 on short notice
 on written request
 order to be confirmed
 our best attention
 our offer is still open
 outside address
to pay the maximum attention to the matter
 payable in advance
 please allow us
 please send us
 please send us your instructions
 prices are increasing
to reach the destination
to refer to
to return a letter to the sender
to sell at the best
to send under separate cover
 sender address
 short term
 similar to sample - up to sample
to stop negotiations
to submit a sample
to suit the quality - to meet the quality
to take into consideration
 the aim of this letter
 the following items
 the goods are available in our warehouse
 the goods are not similar to sample
 the goods are sold out
 the goods arrived in good conditions
 the letter remained unanswered
 the matter in reference
 the meeting was cancelled
 to our mutual benefit
 to the kind attention of
 under separate cover
 up to an amount of
 utmost care
 we acknowledge receipt of
 we apologise again for
 we apologise for
 we apologise for the delay
 we apologise for the mistake
 we are sorry to have to
 we are sorry to inform you
 we have received
 we hope we'll receive the goods soon
 we look forward to your kind reply
 we must apologise for
 we remain - our kindest regards
 we sent you
 we thank you in advance
 we wish to inform you that
 we would appreciate it if you could answer
 we would appreciate your reply
 with no obligation - without commitment
 with reference to - in reference to
 with the compliments of
 with the utmost care
 with two weeks' notice
 within the end of the month
 within which
 without delay
 without notice
 would you please let us have
 would you please let us know
 you ordered
 you requested
 you sent us
 Yours faithfully (GB) - Yours truly (GB)