whitespace throws regex failure and check for servfail
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@ -51,7 +51,7 @@ except (ImportError, AttributeError):
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# even when it's not strictly necessary. This way we don't forget
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# when it is necessary.)
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#
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WSP = r'[ \t]' # see 2.2.2. Structured Header Field Bodies
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WSP = r'[\s]' # see 2.2.2. Structured Header Field Bodies
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CRLF = r'(?:\r\n)' # see 2.2.3. Long Header Fields
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NO_WS_CTL = r'\x01-\x08\x0b\x0c\x0f-\x1f\x7f' # see 3.2.1. Primitive Tokens
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QUOTED_PAIR = r'(?:\\.)' # see 3.2.2. Quoted characters
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@ -101,7 +101,7 @@ def get_mx_ip(hostname):
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try:
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MX_DNS_CACHE[hostname] = DNS.mxlookup(hostname)
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except ServerError as e:
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if e.rcode == 3: # NXDOMAIN (Non-Existent Domain)
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if e.rcode == 3 or e.rcode == 2: # NXDOMAIN (Non-Existent Domain) or SERVFAIL
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MX_DNS_CACHE[hostname] = None
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else:
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raise
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