Prepositions with All right

When "all right" is used to express or to inquire about the attitude of the person indicated by the word that follows (i.e. whether or not a proposal or a suggestion is acceptable to him), the correct preposition is "to," not by.

• I will call at six o'clock if that is all right to you.
• If it's all right to you, it’s all right to me.

"All right for" is used when the speaker is expressing his own opinion of the suitability or acceptability of the thing in question for whoever, or whatever, is mentioned; or, in questions, when he assumes or hopes it is all right and then asks for an affirmation or denial.

• It's all right for the rich; they can afford these taxes, but we poor people cannot.
• These clothes are all right for summer wear, but they are not warm enough for winter.
• Is that all right for you? I have done it according to your instructions.

Note the difference between the following two sentences:

• I propose catching the 3.15 train. Will that be all right to you? (i.e. Do you mind if I catch it?)
• I propose catching the 3.15 train. Will that be all right for you? (i.e. Are you able to catch that one also?)

"For" may, of course, be used by the speaker to refer to himself; e.g. "Don't trouble to get a meal; a cup of coffee and a sandwich will be all right for me." "All right with" expresses the speaker’s opinion of one person or group in their relations with another.

• Some people find him difficult to get on with, but he's always been all right with me.
• Is your dog all right with children?

Reference: "English Prepositional Idioms" by Fredrick T. Wood.