Korean · Pronunciation Guide
mal-ha-da. The ㅎ is wedged between a ㄹ and a vowel, so it weakens noticeably -- fast speech gets close to ma-ra-da.
malhada
A flat three-beat rhythm. The variable here is not stress but how much of the ㅎ survives: careful speech keeps it, casual speech reduces it, and the ㄹ then taps straight into the following vowel. Both versions are normal and neither is an error.
Listen: 말하다
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저한테 말해 주세요.
Jeohante malhae juseyo.
Please tell me.
Listen: 저한테 말해 주세요.
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저한테 말해 주세요 uses the conjugated 말해, where the same lenition applies and the phrase lands close to ma-rae ju-se-yo. Note also that 저한테 keeps its aspirated ㅌ fully intact -- the ㅎ softens, but the ㅌ never does.
Two opposite errors show up here. Some learners give the ㅎ a full English h and produce a hard 'mal-HA-da', which sounds over-articulated. Others delete it entirely even in careful speech, which sounds sloppy in a formal setting. Aim for a light breathy transition, and keep the l bright and forward rather than the dark English l of 'mall'.