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import dns.resolver
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def get_mx_domains(hostname) -> [str]:
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answers = dns.resolver.query(hostname, "MX")
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ret = []
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for a in answers:
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record = a.to_text() # for ex '20 alt2.aspmx.l.google.com.'
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r = record.split(" ")[1] # alt2.aspmx.l.google.com.
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ret.append(r)
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return ret
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