1.Ihopethisletterfindsyouingoodhealthandhighspirits.
2.Thankyoufortakingthetimetoreadmyletter.
3.Iamwritingtoexpressmygratitude/concern/apologyabout...
4.Iwouldliketosharewithyoumythoughts/opinions/experienceson...
5.Iamlookingforwardtohearingfromyousoon.
6.Pleaseletmeknowifyouneedanyfurtherinformation.
7.Iwishyouallthebestforthefuture.
8.Onceagain,thankyouforyourkindness/support/attention.