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public:emai:geninfo [2017-02-02 14:55] – created vesely | public:emai:geninfo [2024-04-22 08:39] – vesely | ||
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- | ===== Email at CERGE-EI in general ===== | + | ====== Email at CERGE-EI in general |
- | ==== Email Services Limitations | + | ===== Email Related Guidelines ===== |
- | ** Amount | + | **CUNI Guideline – Use of private e-mail addresses**: |
- | It is general limitation and cannot be changed for individuals. There are serious reasons to limit this because of security reasons and because of keeping general reputation score of our site high (so your regular emails will be easily accepted by other parties) | + | |
+ | In principle: | ||
+ | < | ||
+ | |||
+ | **…o**// | ||
+ | |||
+ | Conclusion: If you get work email from non-institutional email address (like google.com, seznam.cz, post.de, outlook.com, | ||
+ | |||
+ | ===== Important Eecommendations ===== | ||
+ | |||
+ | **Never use your login name as your email address** - use format name.surname@cerge-ei.cz not username@cerge-ei.cz to avoid guessing your real account name by hackers. If your username is publicly known there is much more oportunity to misuse it. Attackers can repeatedly lock your account during brute-force campaigns, for example. | ||
+ | |||
+ | **Use __different password__ for email account and network account** - passwords to email accounts are usually stored at several places (email clients) so it is much easier to reveal these. If passwords are the same, attacker gain access to all your account. | ||
+ | ===== Email Services Limitations ===== | ||
+ | |||
+ | ==== Amount of emails sent per hour for each user is limited to certain level ==== | ||
+ | |||
+ | Current level is about 100 email sent per hour, which should be enough for regular email use. | ||
+ | |||
+ | It is a general security limitation and cannot be changed for individuals unfortunately. | ||
+ | |||
+ | There are serious objective reasons to limit this mostly because of security reasons and to keep general reputation score of our CERGE-EI site positive (so your regular emails will be well accepted by the other parties in the world) | ||
+ | |||
+ | Anyway, regular email system is not intended for mass mail services because it counts against the SPAM score and REPUTATION of the sit as a whole. | ||
+ | |||
+ | SPAM filters all around the world are becoming more strict every day. It is easy now to be on GRAYLIST or BLACKLIST and hard to get back from it… | ||
+ | |||
+ | === Possible workaround === | ||
+ | |||
+ | You must divide your recipients amount into smaller packs and sent them in more batches sent each hour… | ||
+ | |||
+ | ==== Maximal size of Email Message ==== | ||
+ | |||
+ | //!!! Please note, that base64-encoded files are usually about 137% the size of the original files.// | ||
+ | === Emails from/to CERGE-EI === | ||
+ | |||
+ | Maximal size of email message including attachments is about 20 MB | ||
+ | |||
+ | === Emails sent internaly === | ||
+ | |||
+ | Maximal size of email message including attachments is about 20 MB | ||
+ | |||
+ | ==== Attachment filtering ==== | ||
+ | |||
+ | Some attachments are | ||
+ | < | ||
+ | |||
+ | * **Executable files** | ||
+ | * **Encrypted archives (password protected)** | ||
+ | Actions: | ||
+ | |||
+ | * Emails containing disallowed content (like executable files) are **rejected**. | ||
+ | * **Password protected files are removed** | ||
+ | < | ||
+ | They may contain malicious code, ransomware, viruses. \\ | ||
+ | Don't open any file unless you are certain it's legitimate. \\ | ||
+ | If not sure or have questions, contact helpdesk@cerge-ei.cz</ | ||
+ | |||
+ | ===== Quarantine access ===== | ||
+ | |||
+ | Ironport sends hourly digest about new quarantined messages | ||
+ | |||
+ | It is practical to keep the link to your personal quarantine page for future use (link: View All Quarantined Messages) | ||
+ | |||
+ | for details go to [[: | ||
+ | |||
+ | {{: | ||