-I was talking to Phil yesterday. Oh, by the way, he sends you his regards. Well, he thinks…
Consistency is important in English grammar; the writer uses the past tense to talk about yesterday, but this thing is still the subject matter of the following sentences, why doesn’t the writer use SENT/THOUGHT?
The use of the past ‘sent’ would suggest that this was a single completed action, which wouldn’t really apply to this kind of wish or sentiment. The use of the present simple here indicates that this good wish is not related to any particular time and the ‘sending’ and the ‘thinking’ in that sentence are there all the time.