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XMM-Newton archival observations of the Be/X-ray binary candidate RXJ0103.6-7201 revealed pulsations with a period of ~1323 s. This makes RXJ0103.6-7201 the X-ray pulsar with the longest period known in the SmallMagellanic Cloud (SMC). More than 150 X-ray observations of RX J0103.6-7201 byROSAT, Chandra and XMM-Newton show flux variations by a factor of 50 on timescales of days to years. Using the accurate positions obtained from ACIS-Iimages the optical counterpart is identified with a V = 14.6 mag emission linestar. EPIC spectra of RX J0103.6-7201 above 1 keV are consistent with anabsorbed power-law with column density between (6-9)x10^21 cm^-2, except duringone observation when an extraordinary high value of 1.1x10^23 cm^-2 wasmeasured which strongly attenuated the power-law emission below 3 keV. A softexcess between 0.5 and 1.0 keV is evident in the spectra which becomes bestvisible in the highly absorbed spectrum. The soft component can be reproducedby a thermal plasma emission model with its luminosity strongly correlated withthe total intrinsic source luminosity. Including results from three other SMCBe/X-ray binaries extends the linear correlation over three orders of magnitudein source intensity, strongly suggesting that the same mechanism is responsiblefor the generation of the soft emission.Comment: Accepted for publication in A&A, 8 pages, 6 figure

Discovery of 1323 s pulsations from RX J0103.6–7201: The longest period X-ray pulsar in the SMC