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| B |
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| | -B argument (sendmail program) (  ) |
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| | B code (qf files) ( ) |
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| | -b flag (mailer description) ( ) |
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| | $b macro (sendmail program) ( ) ( ) |
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| | -ba argument (sendmail program) ( ) |
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| | background delivery mode ( ) ( ) |
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| | backslash (\), in recipient names ( ) ( ) |
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| | backups, mail servers and ( ) |
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| | bang-style addressing ( ) ( ) |
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| | Bcc: header line ( ) |
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| | -bd argument (sendmail program) ( ) ( ) |
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| | -bi argument (sendmail program) ( ) |
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| | binary data, transmitting ( ) |
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| | blank lines |
| | | forcing at end of messages ( ) |
| | | sendmail.cf file ( ) |
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| | blank substitute, sendmail configuration option ( ) |
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| | blind carbon copies ( ) |
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| | -bm argument (sendmail program) ( ) |
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| | body of mail messages ( ) ( ) ( ) ( ) |
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| | body type argument (sendmail program) ( ) |
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| | body type code (qf file) ( ) |
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| | bounced messages |
| | | See undelivered messages | |
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| | -bp argument (sendmail program) ( ) ( ) |
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| | brackets |
| | | See curly brackets ({}); square brackets ([]) | |
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| | -bs argument (sendmail program) ( ) |
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| | -bt argument (sendmail program) ( ) ( ) ( ) ( ) |
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| | -bv argument (sendmail program) ( ) ( ) |
