Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 215)

Chapter 16. Email 215

be performed. Conditions are checked based on the ﬂags set in the recipe’s ﬁrst line. Optional special

characters placed after the * character can further control the condition.

The

action-to-perform speciﬁes what is to happen to a message if it matches one of the

conditions. There can only be one action per recipe. In many cases, the name of a mailbox is used

here to direct matching messages into that ﬁle, effectively sorting the email. Special action characters

may also be used before the action is speciﬁed.

16.5.2.1. Delivering vs. Non-Delivering Recipes

The action used if the recipe matches a particular message determines whether recipe is considered

delivering or non-delivering. A delivering recipe contains an action that writes the message to a ﬁle,

sends the message to another program, or forwards the message to another email address. A non-

delivering recipe covers any other actions, such as when a nesting block is used. A nesting block is an

action contained in braces { } that designates additional actions to perform on messages that match

the recipe’s conditions. Nesting blocks can be nested, providing greater control for identifying and

performing actions on messages.

Delivering recipes that match messages causes Procmail to perform the action speciﬁed and stop

comparing the message against any other recipes. Messages that match conditions in non-delivering

recipes will continue to be compared against other recipes in the current and following rc ﬁles. In

other words, non-delivering recipes cause the message to continue through the recipes after the spec-

iﬁed action is taken on it.

16.5.2.2. Flags

Flags are very important in determining how or if a recipe’s conditions are compared to a message.

The following ﬂags are commonly used:

• A — Speciﬁes that this recipe will only be used if the last previous recipe without an A or a ﬂag

also matched this message.

To ensure that the action on this last previous matching recipe was successfully completed before

allowing a match on the current recipe, use the a ﬂag instead.

• B — Parse the body of the message and look for matching conditions.

• b — Use the body in any resulting action, such as writing the message to a ﬁle or forwarding it.

This is the default behavior.

• c — Generate a carbon copy of the email. This is useful with delivering recipes, since the required

action can be performed on the message and a copy of the message can continue being processed

in the rc ﬁles.

• D — Makes the egrep comparison case-sensitive. By default, the comparison process is not case-

sensitive.

• E — Similar to the A ﬂag, except that the conditions in this recipe are only compared to the message

if the immediately preceding recipe without an E ﬂag did not match. This is comparable to an else

action.

Use the e ﬂag instead if you only want this recipe checked if the preceding recipe matched but the

action failed.

• f — Uses the pipe as a ﬁlter.

• H — Parses the header of the message and looks for matching conditions. This occurs by default.

• h — Uses the header in a resulting action. This is the default behavior.

• w — Tells Procmail to wait for the speciﬁed ﬁlter or program to ﬁnish and report whether or not it

was successful before considering the message ﬁltered.

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 281 282

Commenti su questo manuale

Nessun commento

Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 215

Commenti su questo manuale

Prodotti e manuali riguardandi Software di system management Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE