Hi
I am facing a issue of attachments size automatically increases.
For ex :-
“ when I send an attachment of 2mb it get delivered to receiver as 2.7mb, but after downloading it shows again as 2mb only”.
In this case if someone send an attachment of 4.5mb it did not deliver, because of Attachment size limit=5mb .

My postconf shows-
postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
home_mailbox = Maildir/
html_directory = no
inet_interfaces = all
local_recipient_maps =
mail_owner = postfix
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
maximal_queue_lifetime = 15m
message_size_limit = 5242880
mydestination = $myhostname, localhost.$mydomain, localhost, yahoo.com, wipro.com, gmail.com, rediffmail.com, hotmail.com, mail.com, bsnl.com, inbox.com, ldccbank.com, nabard.org, jccb.co.in, yahoo.co.in, idbi.co.in, wdcb.co.in, sify.com, mdcb.com, vsnl.com, sancharnet.in, mahadiscom.in, ho.mahadiscom.in, bankofbaroda.com, gscbank.co.in, nic.in, cdit.org, ymail.com, jkbmail.com, email.com, bobcards.com, mscbank.com, incometax.gov.in, keralagbank.com
mydomain = scbindia.co.in
myhostname = mailsrv3.co-opbank.co.in
mynetworks =
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
relayhost =
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
soft_bounce = no
transport_maps = hash:/etc/postfix/transport
virtual_alias_maps = ldap:/etc/postfix/ldap-aliases.cf,ldap:/etc/postfix/groups.cf
virtual_gid_maps = static:512
virtual_mailbox_base = /
virtual_mailbox_domains = hash:/etc/postfix/vdomains
virtual_mailbox_maps = hash:/etc/postfix/vmaps
virtual_transport = virtual
virtual_uid_maps = static:512

Please guide.

This is normal.
Your file is mime-encoded as text for inclusion in the SMTP transaction, which is inefficient, hence the increase in apparent size when transmitted.
The mail program likely reports the original "binary" size.

What should i do to stop this, because mails with big attachment say 4mb is not get delivered. I also cannot increase the Max_size_limit of attachment.

https://en.wikipedia.org/wiki/Email_attachment


The encoding overhead is around 30%, so if you can't change your max size from 5Mb then you will generally only be able to e-mail files of just over 3Mb

1 members found this post helpful.

This is essentially a duplicate of what you asked in your OTHER thread, where you got an answer with an explanation. Did you not read/understand it? You were asked NUMEROUS questions in that thread, none of which you've answered yet.

Read the LQ rules about posting the same question more than once, and again, unless you're going to answer questions and participate, there is NO POINT in posting.