Sun One IMAP & Microsoft Exchange Coexistence Dan Oberst Princeton University CSG 9/21/04
Dan Oberst, CSG 9/21/04
Dan Oberst, CSG 9/21/04 Central Mail Services Directory “White Pages” service Flat address space is unique Maps to address on IMAP or Exchange Users can also deliver to other service(s) Inbound/outbound SMTP delivery services Listserv – manual and automatic lists Virus & Spam filtering
Dan Oberst, CSG 9/21/04 Virus Protection Symantec Mail Security for SMTP Gateways On inbound SMPT server and listserver Virus updates every 2 hours Strip.hta,.mp3,.pif,.scr,.exe.zip or others when new virus appears More extensive set stripped on listserver Viruses replaced by “DELETED0.TXT” Looking to reject at SMTP with 550
Dan Oberst, CSG 9/21/04 Spam Filtering SpamAssassin tags all inbound messages “DELETED0.TXT” gets high score Delivers mail to target system Handed by server or client rules Users can “tune” selectivity Even when deleted, backups may be retained No individual safe/block lists
Dan Oberst, CSG 9/21/04 Central IMAP Service In production since 1988 18,000 accounts 12,000-16,000 active 10,000 individuals 5,000-6,000 active connections 450,000 messages/day (~40% spam) Faculty/staff (55 MB) ; students (20 MB) ~ 2 FTE staff
Dan Oberst, CSG 9/21/04 IMAP Speeds&Feeds LDAP: Sun e450, 2x480r, 280r, e250 Mail Multiplexor: 2xSun 280r IMAP: 2xSun e4500/5500 v880 Disk: 1.5 TB Hitachi 9200 SAN (mirrored) Inbound SMTP: 2xSun 480R Outbound SMTP: 3xSun e250 Unauthenticated SMTP: Sun e250
Dan Oberst, CSG 9/21/04 IMAP: Viruses & Spam SpamAssassin & Norton AV for Gateways inbound mail only Server-side filters redirect to spam folder Opt-in (~3,000 takers)
Dan Oberst, CSG 9/21/04 Exchange In production since 2002 Exchange 2000 2003 (Fall ’04) ~1,000 accounts 5 major departments Administrative users (of ~2,500 total) ~50,000 messages/day ~1+ FTE Staff Fee-based: $7.50/mailbox/month (55 MB)
Dan Oberst, CSG 9/21/04 Exchange Speeds&Feeds Exchange: 2x Dell PowerEdge 6550 Disk: SCSI Dell PowerVault 220 (800 GB) DoubleTake - 1 minute snapshots on NAS OWA: 2x Dell PowerEdge 6550 AD: 3x Dell PowerEdge 6550 Blackberry Server: Dell PowerEdge 6450
Dan Oberst, CSG 9/21/04 Exchange Viruses & Spam Clients set Rules to filter spam Reads SpamAssassin headers Symantec Mail Security 4.5 for Exchange Scans mail store for viruses that slip through Performance issues during peak load
Dan Oberst, CSG 9/21/04 Blackberry Support Computer Science were earlier adopters “Throw-away” Exchange service; ~12 users Central Support since late 2003 Several vocal departments requested it (Washington Office) Became “device of choice” among administration Ease of use & integration “It just works” Fee-based: $160 setup; $10/mo; +device & service costs Grown to over 50 users
Dan Oberst, CSG 9/21/04 Blackberry Users By Office Department or Office Woodrow Wilson School20 Nassau Hall (Senior Administration)11 Office of Information Technology6 Human Resources4 Art Museum3 Athletics3 Communications2 Misc.7 Total56
Dan Oberst, CSG 9/21/04 Other Handheld Support Informal poll of computer support staff: ~70 devices with some integration Half desktop sychronization 25% WiFi 25% WAN (Mobitext, GSM, etc.) Investment Company (Princo) big Good users Authenticated SMTP/Exchange-IMAP Problem for older devices
Dan Oberst, CSG 9/21/04 Futures Spam Growing problem 40% of mail; steady percent, but growing volume Processing and storage Users need to remember to delete Deleted mail stays around for 90 days Evaluating firewalls Reject well-known spam sites/SPF/RBL Quarantine and expire spam Integrate with anti-virus Software (Proofpoint) vs. appliance (Barracuda)
Dan Oberst, CSG 9/21/04 Future Issues Calendaring Dilemma Residual OnTime users End of life product Exchange requires conversion, $ Obstacles to more 9’s (more important than phone) Successive RAID5 disk failures Software problems Sticker-shock at full redundancy Increasing complexity=more points of failure Growing demands: cycles, storage, services