Automated Mail Purging for SMTP Mail
Copy the scripts to your favorite directory. I used /usr/local/bin. Edit mailrm.sh and mailage.sh to reflect your mail directory and the location of formail. Then just run the script with the number of days to retain messages as its argument. For example, to purge messages older than 60 days:
Is this mail purge solution perfect? No, it does nothing to lock mail files, which could pose a problem if a user's mail client polls frequently or this job runs during busy hours. Some possible steps to address this could include stopping sendmail while the scripts run, preventing the POP3 server from running and tightening permissions on the mail directory to prevent access from non-superusers. Since it would normally run in the early-morning hours via cron, the probability of collision would be low.
Also, this solution relies on external utilities that may not function as expected. formail might not properly handle all the mail headers, though I haven't encountered problems yet. cat might not like some characters that could appear in messages, resulting in lost message text. I've had few problems with cat, but your experience may be different.
The date conversion logic in maildate.sh is simplistic. It's not accurate for the year 1900, and the leap year calculation will not work correctly after the year 2099. However, it works well for calculating the difference between two dates, and it's reasonably fast.
Since I use three scripts to get around parameter-passing limitations in Bash, this package runs more slowly than it might (because of having to fork processes repeatedly). Recoding the scripts into a single Perl script might help—my Perl skills are too limited for this project.
If you have a need for automated mail purging, these scripts can help you reach your goal. At least, they may give you ideas for your own solution. If you create a more elegant solution, I'd like to hear about it.
All listings referred to in this article are available by anonymous download in the file ftp://ftp.linuxjournal.com/lj/listings/issue47/2118.tgz.
Michael S. Keller (firstname.lastname@example.org) is a Technical Analyst with Paranet, Inc., a nation-wide network services provider owned by Sprint. He has used computers for twenty years and Unix variants for seven. Paranet's virtual home is at http://www.paranet.com/.
- Three EU Industries That Need HPC Now
- Chemistry on the Desktop
- Five HPC Cost Considerations to Maximize ROI
- FinTech and SAP HANA
- HOSTING Monitoring Insights
- Preseeding Full Disk Encryption
- William Rothwell and Nick Garner's Certified Ethical Hacker Complete Video Course (Pearson IT Certification)
- Two Factors Are Better Than One
- Two Ways GDPR Will Change Your Data Storage Solution
- GRUB Boot from ISO
Pick up any e-commerce web or mobile app today, and you’ll be holding a mashup of interconnected applications and services from a variety of different providers. For instance, when you connect to Amazon’s e-commerce app, cookies, tags and pixels that are monitored by solutions like Exact Target, BazaarVoice, Bing, Shopzilla, Liveramp and Google Tag Manager track every action you take. You’re presented with special offers and coupons based on your viewing and buying patterns. If you find something you want for your birthday, a third party manages your wish list, which you can share through multiple social- media outlets or email to a friend. When you select something to buy, you find yourself presented with similar items as kind suggestions. And when you finally check out, you’re offered the ability to pay with promo codes, gifts cards, PayPal or a variety of credit cards.Get the Guide