Delivery Temporarily Suspended Unknown Mail Transport Error Postfix
Kanisha Dezarn
However, I'd like to temporarily suspend mail delivery to a destination for 24 or 48 hours (mails to *@gmail.com suspended, everything else delivered). Messages would queue up during this time, and would be delivered only when I want by changing the config.
i'm setting up a mail server [postfix] which with use Ciphermail as RelayHost.With the setup i'm able to send mail to external domain but when i'm replying from external domain i'm getting following error.
Delivery Temporarily Suspended Unknown Mail Transport Error Postfix
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Ensure that your application uses retry logic when it connects to the Amazon SES SMTP endpoint, and that your application can detect and retry message delivery in case of a network error. SMTP is a verbose protocol, and sending an email using this protocol requires several network round trips. Because of the nature of SMTP, the potential for network errors increases.
The term delivery transport refers to the protocol, or language, used to deliver the message from one mail server to another. The transport on modern systems is nearly always smtp, and this is the default in Postfix, but there are still a few legacy uucp systems in use. This option is merely the default choice, when no transport is explicitly selected for the destination in the optional transport table. This option corresponds to the default_transport directive.
This specifies the directory where Postfix will store queued mail. This will also be the root directory for Postfix daemons that run in a chroot environment. The queue is where messages that are awaiting delivery are stored, thus enough space to accommodate your user mail load should be provided in this directory. This option correlates to the queue_directory directive and usually defaults to a sensible location for your OS. Many Linux systems will have the mail queue in /var/spool/mail or /var/spool/postfix.
This configures the name of the transport that will be used for delivery to destination that match the $mydestination or $inet_interfaces variables. This can be a simple mailbox drop handled by the Postfix local delivery agent, or any appropriate delivery command. This option correlates to the local_transport directive and defaults to the defined transport type named local.
This option configures the message transport to use for all local users, whether they are in the UNIX passwd database or not. If provided, the value will override all other forms of local delivery, including Destination address for unknown recipients. This option corresponds to the mailbox_transport directive and is disabled by default. This option may be useful in some environments, for example, to delegate all delivery to an agent like the cyrus IMAPD.
This option configures the time in seconds between the queue manager attempts to contact an unresponsive mail delivery transport. This option correlates to the transport_retry_time and defaults to 60s.
As discussed in the BIND chapter, a mail server performs a name server query to find the MX, or mail server, record for the destination domain. If this record indicates that the local server is the server to which mail should be sent, it can respond in a couple of ways. The default is to bounce the message with an error indicating a mail loop. If the field is selected and local is entered, the mail will be directed to the local delivery agent instead of bouncing the mail. This option correlates to the best_mx_transport directive.
By default, a mail that cannot be delivered because the destination is invalid will be bounced with an appropriate error message. However, it is possible to configure postfix to hand off email to another server instead. This option correlates to the fallback_relay directive.
If a remote server responds to a connection with a 4XX status code, postfix will, by default, select the next available mail exchanger specified by the MX records. If set to No, mail delivery will be deferred after the first mail delivery attempt and another attempt will be made later. This option correlates to the smtp_skip_4xx_greeting directive.
This field specifies which delivery transports, if any, of the transports defined in the Transport Mapping section will not have their messages sent automatically. Instead the messages for these transports will be queued, and can be delivered manually using the sendmail -q command. This option correlates to the defer_transports directive, and contains nothing by default.
This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
A server employing greylisting temporarily rejects email from unknown or suspicious sources by sending 4xx reply codes ("please call back later"), as defined in the Simple Mail Transfer Protocol (SMTP). Fully capable SMTP implementations are expected to maintain queues for retrying message transmissions in such cases,[1] and so while legitimate mail may be delayed, it should still get through.[2]
Greylisting is effective against mass email tools used by spammers that do not queue and reattempt mail delivery as a regular mail transport agent normally does. Delaying delivery also gives real-time blackhole lists and similar lists the time to identify and flag the spam source. Thus, these subsequent attempts are more likely to be detected as spam by other mechanisms than they were before the greylisting delay.
Specify, for example, "best_mx_transport = local" to pass the mailfrom the Postfix SMTP client to the local(8) delivery agent. Youcan specifyany message delivery "transport" or "transport:nexthop" that isdefined in the master.cf file. See the transport(5) manual pagefor the syntax and meaning of "transport" or "transport:nexthop".
After the message is queued, send the entire message to thespecified transport:destination. The transport namespecifies the first field of a mail delivery agent definition inmaster.cf; the syntax of the next-hop destination is describedin the manual page of the corresponding delivery agent. Moreinformation about external content filters is in the PostfixFILTER_README file.
As of Postfix version 2.5, negative feedback cannot reducedelivery concurrency to zero. Instead, a destination is markeddead (further delivery suspended) after the failed pseudo-cohortcount reaches $default_destination_concurrency_failed_cohort_limit(or $transport_destination_concurrency_failed_cohort_limit).To make the scheduler completely immune to connection or handshakefailures, specify a zero feedback value and a zero failed pseudo-cohortlimit.
NOTE: with a non-zero _destination_rate_delay, specify atransport_destination_concurrency_failed_cohort_limit of 10or more to prevent Postfix from deferring all mail for the samedestination after only one connection or handshake error.
The default mail delivery transport and next-hop destination fordestinations that do not match $mydestination, $inet_interfaces,$proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains,or $relay_domains. This information can be overruled with thesender_dependent_default_transport_maps parameter and with thetransport(5) table.
Specify a string of the form transport:nexthop, where transportis the name of a mail delivery transport defined in master.cf.The :nexthop destination is optional; its syntax is documentedin the manual page of the corresponding delivery agent.
The names of message delivery transports that should not deliver mailunless someone issues "sendmail -q" or equivalent. Specify zeroor more names of mail delivery transports names that appear in thefirst field of master.cf.
Report mail delivery errors to the address specified with thenon-standard Errors-To: message header, instead of the envelopesender address (this feature is removed with Postfix version 2.2, isturned off by default with Postfix version 2.1, and is always turned onwith older Postfix versions).
The recipient of postmaster notifications about mail deliveryproblems that are caused by policy, resource, software or protocolerrors. These notifications are enabled with the notify_classesparameter.
The maximal number of parallel deliveries via the local maildelivery transport to the same recipient (when"local_destination_recipient_limit = 1") or the maximal number ofparallel deliveries to the same local domain (when"local_destination_recipient_limit > 1"). This limit is enforced bythe queue manager. The message delivery transport name is the firstfield in the entry in the master.cf file.
The maximal number of recipients per message delivery via thelocal mail delivery transport. This limit is enforced by the queuemanager. The message delivery transport name is the first field inthe entry in the master.cf file.
The default mail delivery transport and next-hop destinationfor final delivery to domains listed with mydestination, and for[ipaddress] destinations that match $inet_interfaces or $proxy_interfaces.This information can be overruled with the transport(5) table.
The list of domains that are delivered via the $local_transportmail delivery transport. By default this is the Postfix local(8)delivery agent which looks up all recipients in /etc/passwd and/etc/aliases. The SMTP server validates recipient addresses with$local_recipient_maps and rejects non-existent recipients. See alsothe local domain class in the ADDRESS_CLASS_README file.
The $local_transport delivery method is also selected for mailaddressed to user@[the.net.work.address] of the mail system (theIP addresses specified with the inet_interfaces and proxy_interfacesparameters).
Domains that match $relay_domains are delivered with the$relay_transport mail delivery transport. The SMTP server validatesrecipient addresses with $relay_recipient_maps and rejects non-existentrecipients. See also the relay domains address class in theADDRESS_CLASS_README file.
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