'suitable for sending' is a correct and usable phrase in written English.
It can be used to describe something that can be posted, emailed or otherwise sent to a recipient. For example: This parcel is securely packaged and suitable for sending.
Select the most suitable method for sending your letter to the Attorney General.
Thank you for sending us your photo but unfortunately it is not suitable for use on facespinTM.
And, as a special thank-you to those who've already bought those products, the first forty-seven thousand five hundred of you who send us a proof-of-purchase seal will receive a legal-liability release suitable for signing and sending right back to us.
Last year with Engelbert Humperdinck, we took a big name that was suitable for the place we sent him [Azerbaijan].
"The very act of rejecting erotica as a category suitable for public libraries sends an unmistakable message of condemnation that is moralistic in tone, and totally inappropriate in a public institution dedicated to serving the needs and interests of all members of the community".
Parents identified as suitable for recruitment were sent a letter prior to their child's clinic appointment explaining the study rationale and what was involved.
On reaching Port Stanley, Shackleton informed London by cable of his whereabouts, and requested that a suitable vessel be sent south for the rescue operation.
Many suggestions for suitable memorials were sent to Oklahoma City, but an official memorial planning committee was not set up until early 1996, when the Murrah Federal Building Memorial Task Force, composed of 350 members, was set up to formulate plans for a memorial to commemorate the victims of the bombing.
In case of AVM nidal remnants not suitable for embolization, patients were sent for radiosurgery.
In one patient coronary morphology was not suitable for PCI and was therefore sent for acute coronary artery bypass grafting (CABG).
