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Domain name

SPF Qualifiers:

• + for a PASS result. This can be omitted; e.g., +mx is the same as mx.
• ? for a NEUTRAL result interpreted like NONE (no policy).
• ~ (tilde) for SOFTFAIL, a debugging aid between NEUTRAL and FAIL. Typically, messages that return a SOFTFAIL are accepted but tagged.
• - (minus) for FAIL, the mail should be rejected (see below).