The maximum size of a single message is currently also limited to 4GB.įolder space/size limits depend on whether you are using mbox or maildir storage format. The number of messages in a folder is limited to 4 billion (2^32 in a 32bit counter). Once the limit is reached, this may cause a "Unable to load address book" or a "Unable to open summary file error" messages. If you open too many different folders you'll run into that limit, even if you closed most of the folders (there is a cache keeping old folders open for a while). For folders backed by mbox storage, opening a folder means opening the file containing the message data. On Linux, the OS limit of open files is around 1024 by default. Supposedly there is a hard coded limit in Thunderbird of 256 file descriptors under Solaris. Any limitations would be due to your e-mail provider.Ī file descriptor/file handle is a data structure used to access a file via operating system functions. You can receive messages sent to multiple addresses in the same mailbox. However, if you use lists (mail distribution lists) for most of the addresses any limit is imposed by whatever SMTP server you use. There appears to be a limit of approximately 60 addresses when sending messages if you enter each address separately. There is a limit of 50 custom headers (they are defined using the "customize." option at the bottom of the leftmost list box in searches and message filters, or by editing mailnews.customHeaders using the config editor). Since Thunderbird doesn't support those preferences the limit appears to be the default value in Firefox. Firefox defaults to a limit of 50 cookies per site and 1000 total, which you can change using and. You can copy and reuse the cookies.txt file from your Firefox profile. Thunderbird disables cookies by default, but they can be useful for RSS and the Webmail and ThunderBrowse extensions. This article provides more information and a workaround. Thunderbird 1.5 is incompatible with Outlook in how it stores the filenames of attachments when they exceed 64 bytes. Note that sending a binary file as a attachment increases its size by a third due to base64 encoding sending two 8-bit characters as three 7-bit ASCII characters. Any limits are due to your e-mail provider or SMTP server. Thunderbird doesn't appear to impose any limit on the number of attachments or the maximum size of the attachment you can send in a message. However, it didn't seem to effect auto-completion when composing a message.) It took a long time to switch to that address book or to switch between one of the normal cards and the one with a 4.2MB note. (One user reports a 4,265 KB address book of several contacts, including one with a 4.2MB note. This can result in general slowness of Thunderbird, not just slow address autocomplete. The reason is that for every address book that gets used while running Thunderbird, all the contacts in that address book are loaded into memory and stay in memory. )Īlthough there might not be limits on the address book size or the notes section in a card, you may easily encounter performance problems when you reach several thousand contacts or have many large notes. Another has 90,000 addresses in one address book and the address book has become so slow it is unusable. (One user has 30,000 addresses spread across 63 address books. However, for large numbers of contacts at some point you should consider putting your contacts in an LDAP server instead. There is no known limit on the number of address books you can have or the number of addresses in an address book. One user is using 150 accounts with Thunderbird 24.0. If you run into one, it probably would be either a bug in how many accounts the folder pane can display or due to "Use Global Inbox" being checked for that account. There is no known limit of the number of accounts you can have.
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